From 49f2850c5eeead43e65b31d68b694c2d3b81f684 Mon Sep 17 00:00:00 2001
From: DuHouAn <18351926682@163.com>
Date: 2019年7月25日 23:46:18 +0800
Subject: [PATCH 1/4] Java
---
 ...345円215円260円351円223円276円350円241円250円.java" &#124; 32 +++++++
 ...347円232円204円346円225円260円345円255円227円.java" &#124; 38 +++++++++
 ...345円276円205円345円244円204円347円220円206円.java" &#124; 37 +++++++++
 ...347円247円257円346円225円260円347円273円204円.java" &#124; 36 ++++++++
 ...347円232円204円350円267円257円345円276円204円.java" &#124; 83 +++++++++++++++++++
 5 files changed, 226 insertions(+)
 create mode 100644 "docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java"
 create mode 100644 "docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java"
 create mode 100644 "docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java"
 create mode 100644 "docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java"
 create mode 100644 "docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java"
diff --git "a/docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java" "b/docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java"
new file mode 100644
index 0000000..c73507b
--- /dev/null
+++ "b/docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java"
@@ -0,0 +1,32 @@
+import java.util.ArrayList;
+
+/**
+ * Created by DHA on 2019年7月22日.
+ */
+public class 从尾到头打印链表 {
+ //从尾到头打印链表
+ public ArrayList<integer> printListFromTailToHead(ListNode listNode) {
+ ArrayList<integer> res = new ArrayList<strong>();
+
+ //逆置该链表
+ ListNode head = reverse(listNode);
+ while(head!=null){
+ res.add(head.val);
+ head = head.next;
+ }
+ return res;
+ }
+
+ private ListNode reverse(ListNode listNode){
+ ListNode pre = null;
+ ListNode cur = listNode;
+ while(cur!=null){
+ ListNode next = cur.next;
+ cur.next = pre;
+
+ pre = cur;
+ cur = next;
+ }
+ return pre;
+ }
+}
diff --git "a/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" "b/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java"
new file mode 100644
index 0000000..3dd4684
--- /dev/null
+++ "b/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java"
@@ -0,0 +1,38 @@
+import org.junit.Test;
+
+/**
+ * Created by DHA on 2019年7月22日.
+ */
+public class 数组中重复的数字 {
+ //数组中重复的数字
+ public boolean duplicate(int numbers[],int length,int [] duplication) {
+ for(int i=0;i<length;i++){ + if(numbers[i]!=numbers[numbers[i]]){ + swap(numbers,i,numbers[i]); + i--; + } + } + + for(int i=0;i<length;i++){ + if(numbers[i]!=i){ + duplication[0]=numbers[i]; + return true; + } + } + return false; + } + + private void swap(int[] nums,int i,int j){ + int tmp = nums[i]; + nums[i] = nums[j]; + nums[j] = tmp; + } + + @Test + public void test(){ + int[] nums = {2,3,1,0,2,5,3}; + int[] duplication = new int[nums.length]; + System.out.println(duplicate(nums,nums.length,duplication)); + System.out.println(duplication[0]); + } +} diff --git "a/docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java" "b/docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java" new file mode 100644 index 0000000..ada8700 --- /dev/null +++ "b/docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java" @@ -0,0 +1,37 @@ +import org.junit.Test; + +/** + * Created by DHA on 2019/7/25. + */ +public class 机器人的运动范围 { + private int m,n; + + private int[][] d={ + {0,1}, //向右 + {-1,0},//向上 + {0,-1},//向左 + {1,0} //向下 + }; + + //获取一个数各个位上的数字相加 + private int getNum(int num){ + int sum = 0; + while(num>0){
+ sum += num %10;
+ num/=10;
+ }
+ return sum;
+ }
+
+
+
+ public int movingCount(int threshold, int rows, int cols) {
+
+ }
+
+ @Test
+ public void test(){
+ int num = 37;
+ System.out.println(getNum(num));
+ }
+}
diff --git "a/docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java" "b/docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java"
new file mode 100644
index 0000000..bb5acd5
--- /dev/null
+++ "b/docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java"
@@ -0,0 +1,36 @@
+import org.junit.Test;
+
+/**
+ * Created by DHA on 2019年7月22日.
+ */
+public class 构建乘积数组 {
+ //构建乘积数组
+ //思路:
+ //B[i]=A[0]*A[1]*...*A[i-1]*A[i+1]*...*A[n-1]。
+ //B[i] 可拆分成 (A[0]*A[1]*...*A[i-1])*(A[i+1]*...*A[n-1])两部分
+ public int[] multiply(int[] A) {
+ int n = A.length;
+ int[] B = new int[n];
+
+ //B[i] = A[0]*A[1]*...*A[i-1]
+ int product =1;
+ for(int i=0;i<n;product*=a[i],i++){ + B[i] = product; + } + //B[i] = B[i] * (A[i+1]*...*A[n-1]) + product=1; + for(int i=n-1;i>=0;product*=A[i],i--){
+ B[i]*= product;
+ }
+ return B;
+ }
+
+ @Test
+ public void test(){
+ int[] A={1,2,3,4,5};
+ int[] B=multiply(A);
+ for(int num:B){
+ System.out.println(num);
+ }
+ }
+}
diff --git "a/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" "b/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java"
new file mode 100644
index 0000000..37c982c
--- /dev/null
+++ "b/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java"
@@ -0,0 +1,83 @@
+import org.junit.Test;
+
+/**
+ * Created by DHA on 2019年7月25日.
+ */
+public class 矩阵中的路径 {
+ private int m,n; //矩阵的长度、宽度
+ private boolean[][] visted; //标记是否访问
+
+ private int[][] d={
+ {0,1}, //向右
+ {-1,0},//向上
+ {0,-1},//向左
+ {1,0} //向下
+ };
+
+ private boolean inArea(int x,int y){
+ return (x>=0 && x<m) && (y>=0 && y<n); + } + + //从board[startx][starty]开始寻找word[index...word.ength()] + private boolean searchMatrix(char[][] matrix, char[] str,int index,int startx,int starty){ + if(index==str.length-1){ //递归到最后一个元素,检测是否相等 + return matrix[startx][starty] == str[index]; + } + if(matrix[startx][starty]==str[index]){ + visted[startx][starty] = true; + for(int i=0;i<4;i++){ + int newX = startx+d[i][0]; + int newY = starty+d[i][1]; + if(inArea(newX,newY) && !visted[newX][newY]){ + if(searchMatrix(matrix,str,index+1,newX,newY)){ + return true; + } + } + } + visted[startx][starty] =false; + } + return false; + } + + //构建二维矩阵 + private char[][] buildMatrix(char[] array, int rows, int cols){ + //根据char[] matrix, rows, cols 构建二维的矩阵 + char[][] matrix = new char[rows][cols]; + int index=0; + for(int i=0;i<rows;i++) { + for (int j = 0; j < cols; j++) { + matrix[i][j] = array[index++]; + } + } + return matrix; + } + + //matirx 就是字符串矩阵; + //rows 和 cols 是其长度和宽度 + public boolean hasPath(char[] array, int rows, int cols, char[] str) { + if(rows==0){ + return false; + } + char[][] matrix = buildMatrix(array,rows,cols); + + m = rows; + n = cols; + visted = new boolean[m][n]; + + for(int i=0;i<m;i++){ + for(int j=0;j<n;j++){ + if(searchMatrix(matrix,str,0,i,j)){ + return true; + } + } + } + return false; + } + + @Test + public void test(){ + char[] matrix = "abcesfcsadee".toCharArray(); + char[] str="bcced".toCharArray(); + System.out.println(hasPath(matrix,3,4,str)); + } +} From 63872847f04ccfe02ed160868d20c824b9f6d3b3 Mon Sep 17 00:00:00 2001 From: DuHouAn <18351926682@163.com>
Date: 2019年8月14日 20:29:41 +0800
Subject: [PATCH 2/4] Java
---
 docs/AimForOffer/MyQueue.java &#124; 56 +++++++++++++
 docs/AimForOffer/ThreadSafeLRUCache.java &#124; 49 ++++++++++++
 docs/AimForOffer/TreeLinkNode.java &#124; 13 +++
 docs/AimForOffer/TreeNode.java &#124; 9 +++
 ...52347円273円223円347円202円271円_Important.java" &#124; 31 ++++++++
 ...63345円217円260円351円230円266円_Important.java" &#124; 32 ++++++++
 ...344円272円214円345円217円211円346円240円221円.java" &#124; 30 +++++++
 ...347円232円204円346円225円260円345円255円227円.java" &#124; 13 +--
 ...17346円225円260円345円255円227円_Important.java" &#124; 58 ++++++++++++++
 ...42347円251円272円346円240円274円_Important.java" &#124; 43 ++++++++++
 ...347円216円260円351円230円237円345円210円227円.java" &#124; 35 ++++++++
 ...42350円246円206円347円233円226円_Important.java" &#124; 37 +++++++++
 ...347円232円204円350円267円257円345円276円204円.java" &#124; 79 +------------------
 ...350円267円263円345円217円260円351円230円266円.java" &#124; 29 +++++++
 14 files changed, 424 insertions(+), 90 deletions(-)
 create mode 100644 docs/AimForOffer/MyQueue.java
 create mode 100644 docs/AimForOffer/ThreadSafeLRUCache.java
 create mode 100644 docs/AimForOffer/TreeLinkNode.java
 create mode 100644 docs/AimForOffer/TreeNode.java
 create mode 100644 "docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java"
 create mode 100644 "docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java"
 create mode 100644 "docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java"
 create mode 100644 "docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java"
 create mode 100644 "docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java"
 create mode 100644 "docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java"
 create mode 100644 "docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java"
 create mode 100644 "docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java"
diff --git a/docs/AimForOffer/MyQueue.java b/docs/AimForOffer/MyQueue.java
new file mode 100644
index 0000000..59d933c
--- /dev/null
+++ b/docs/AimForOffer/MyQueue.java
@@ -0,0 +1,56 @@
+import java.util.Stack;
+
+/**
+ * Created by 18351 on 2019年7月23日.
+ */
+//使用两个栈实现队列的扩展
+public class MyQueue {
+ //用两个栈实现队列
+ Stack<integer> stack1 = new Stack<strong>();
+ Stack<integer> stack2 = new Stack<strong>();
+
+ //存储队列头元素
+ private int front; //方便后面的 peek() 操作
+
+ /** Initialize your data structure here. */
+ public MyQueue() {
+ stack1 = new Stack<strong>();
+ stack2 = new Stack<strong>();
+ }
+
+ public void push(int node) {
+ if(stack1.isEmpty()){
+ front = node;
+ }
+ stack1.push(node);
+ }
+
+ public int pop() {
+ if(stack2.isEmpty()){
+ while(!stack1.isEmpty()){
+ stack2.push(stack1.pop());
+ }
+ }
+ return stack2.pop();
+ }
+
+ public int peek(){
+ if(stack2.isEmpty()){
+ return front;
+ }
+ return stack2.peek();
+ }
+
+ public boolean empty(){
+ return (stack1.isEmpty()) && (stack2.isEmpty());
+ }
+
+ public static void main(String[] args) {
+ MyQueue queue = new MyQueue();
+ queue.push(1);
+ queue.push(2);
+ System.out.println(queue.peek()); // 返回 1
+ System.out.println(queue.pop()); // 返回 1
+ queue.empty(); // 返回 false
+ }
+}
diff --git a/docs/AimForOffer/ThreadSafeLRUCache.java b/docs/AimForOffer/ThreadSafeLRUCache.java
new file mode 100644
index 0000000..b725030
--- /dev/null
+++ b/docs/AimForOffer/ThreadSafeLRUCache.java
@@ -0,0 +1,49 @@
+import org.junit.Test;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * Created by 18351 on 2019年7月25日.
+ */
+public class ThreadSafeLRUCache<k, V> {
+ private static final int MAX_CAPACITY = 3;
+ private LinkedHashMap<k,v> linkedHashMap;
+
+ public ThreadSafeLRUCache(){
+ linkedHashMap = new LinkedHashMap(MAX_CAPACITY,0.75f,false){
+ @Override
+ protected boolean removeEldestEntry(Map.Entry eldest) {
+ return size()>MAX_CAPACITY;
+ }
+ };
+ }
+
+ public synchronized void put(K k,V v){
+ linkedHashMap.put(k,v);
+ }
+
+ public synchronized V get(K k){
+ return (V)linkedHashMap.get(k);
+ }
+
+ @Override
+ public String toString() {
+ StringBuilder sb=new StringBuilder();
+ for(Map.Entry<k,v> entry:linkedHashMap.entrySet())
+ sb.append(String.format("%s: %s\n", entry.getKey(), entry.getValue()));
+ return sb.toString();
+ }
+
+ @Test
+ public void test(){
+ ThreadSafeLRUCache<integer,string> cache=new ThreadSafeLRUCache<strong>();
+ cache.put(1, "a");
+ cache.put(2, "b");
+ cache.put(3, "c");
+ cache.get(1);
+ //LRU 键值1被访问过了,则最近最久未访问的就是2
+ cache.put(4, "d");
+ System.out.println(cache);
+ }
+}
diff --git a/docs/AimForOffer/TreeLinkNode.java b/docs/AimForOffer/TreeLinkNode.java
new file mode 100644
index 0000000..c277e9e
--- /dev/null
+++ b/docs/AimForOffer/TreeLinkNode.java
@@ -0,0 +1,13 @@
+/**
+ * Created by 18351 on 2019年7月23日.
+ */
+public class TreeLinkNode {
+ int val;
+ TreeLinkNode left = null;
+ TreeLinkNode right = null;
+ TreeLinkNode next = null;
+
+ TreeLinkNode(int val) {
+ this.val = val;
+ }
+}
diff --git a/docs/AimForOffer/TreeNode.java b/docs/AimForOffer/TreeNode.java
new file mode 100644
index 0000000..c9297d8
--- /dev/null
+++ b/docs/AimForOffer/TreeNode.java
@@ -0,0 +1,9 @@
+/**
+ * Created by 18351 on 2019年7月23日.
+ */
+public class TreeNode {
+ int val;
+ TreeNode left;
+ TreeNode right;
+ TreeNode(int x) { val = x; }
+}
diff --git "a/docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java" "b/docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java"
new file mode 100644
index 0000000..7a2963c
--- /dev/null
+++ "b/docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java"
@@ -0,0 +1,31 @@
+import java.util.Scanner;
+
+/**
+ * Created by 18351 on 2019年7月23日.
+ */
+public class 二叉树的下一个结点_Important {
+ //二叉树的下一个结点
+ public TreeLinkNode GetNext(TreeLinkNode pNode){
+ if(pNode==null){
+ return null;
+ }
+ if(pNode.right!=null){
+ //先判断 pNode 的右子树不为 null,
+ //pNode 的下一个结点就是 pNode 右子树的最左结点
+ TreeLinkNode node = pNode.right; //pNode 的右子树
+ while(node.left!=null){
+ node = node.left;
+ }
+ return node;
+ }else{ //否则,向上找第一个左连接指向的树包含该节点的祖先节点
+ while (pNode.next!=null){
+ TreeLinkNode parent = pNode.next;
+ if(parent.left==pNode){
+ return parent;
+ }
+ pNode = pNode.next;
+ }
+ }
+ return null;
+ }
+}
diff --git "a/docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java" "b/docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java"
new file mode 100644
index 0000000..ceaa998
--- /dev/null
+++ "b/docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java"
@@ -0,0 +1,32 @@
+import org.junit.Test;
+
+import java.util.Arrays;
+
+/**
+ * Created by 18351 on 2019年7月24日.
+ */
+public class 变态跳台阶_Important {
+ //动态规划思路:
+ //dp[i] 表示跳 i 阶台阶共有 dp[i] 中跳法
+ public int JumpFloorII(int target) {
+ int[] dp=new int[target+1];
+ //dp 数组数值初始化为 1
+ Arrays.fill(dp,1);
+
+ for(int i=2;i<=target;i++){ + for(int j=1;j<i;j++){ //每次青蛙可跳 j 步 + dp[i] = dp[i] + dp[j]; + } + } + return dp[target]; + } + + @Test + public void test(){ + //int target = 3; + //int target = 4; + //int target = 5; + int target = 6; + System.out.println(JumpFloorII(target)); + } +} diff --git "a/docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java" "b/docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java" new file mode 100644 index 0000000..12b9aa7 --- /dev/null +++ "b/docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java" @@ -0,0 +1,30 @@ +/** + * Created by 18351 on 2019/7/23. + */ +public class 重建二叉树 { + public TreeNode reConstructBinaryTree(int [] pre, int [] in) { + return reConstructBinaryTree(pre,in,0,pre.length-1,0,in.length-1); + } + + private TreeNode reConstructBinaryTree(int[] pre,int[] in, + int preStart,int preEnd, + int inStart,int inEnd){ + if(preStart>preEnd &#124;&#124; inStart>inEnd){
+ return null;
+ }
+ TreeNode root = new TreeNode(pre[preStart]);
+
+ int index = -1;
+ for(int i=inStart;i<=inend;i++){ + if(in[i]==pre[preStart]){ + index = i; + break; + } + } + root.left = reConstructBinaryTree(pre,in, + preStart+1,preStart+(index-inStart),inStart,index-1); + root.right = reConstructBinaryTree(pre,in, + preStart+(index-inStart)+1,preEnd,index+1,inEnd); + return root; + } +} diff --git "a/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" "b/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" index 3dd4684..54c4855 100644 --- "a/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" +++ "b/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" @@ -1,10 +1,7 @@ -import org.junit.Test; - /** - * Created by DHA on 2019/7/22. + * Created by 18351 on 2019/7/23. */ public class 数组中重复的数字 { - //数组中重复的数字 public boolean duplicate(int numbers[],int length,int [] duplication) { for(int i=0;i<length;i++){ if(numbers[i]!=numbers[numbers[i]]){ @@ -27,12 +24,4 @@ private void swap(int[] nums,int i,int j){ nums[i] = nums[j]; nums[j] = tmp; } - - @Test - public void test(){ - int[] nums = {2,3,1,0,2,5,3}; - int[] duplication = new int[nums.length]; - System.out.println(duplicate(nums,nums.length,duplication)); - System.out.println(duplication[0]); - } } diff --git "a/docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java" "b/docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java" new file mode 100644 index 0000000..3c6b80d --- /dev/null +++ "b/docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java" @@ -0,0 +1,58 @@ +import org.junit.Test; + +/** + * Created by 18351 on 2019/7/25. + */ +public class 旋转数组的最小数字_Important { + //思路一: + //遍历,遇到前一个数大于后一个数,就返回后一个数 + //时间复杂度是 O(n) + public int minNumberInRotateArray_1(int [] array) { + if(array==null &#124;&#124; array.length==0){ + return 0; + } + if(array.length==1){ + return array[0]; + } + //此时数组中至少有 2 个元素 + int res = array[0]; + for(int i=1;i<array.length;i++){ + if(array[i-1]>array[i]){
+ res = array[i];
+ break;
+ }
+ }
+ return res;
+ }
+
+ //二分查找的变形:
+ //关键在于确定旋转数组在那一部分
+ public int minNumberInRotateArray(int [] array) {
+ if(array==null &#124;&#124; array.length==0){
+ return 0;
+ }
+ if(array.length==1){
+ return array[0];
+ }
+
+ int l=0;
+ int h=array.length-1;
+ while(l<h){ + int m = (h-l)/2+l; + if(array[m]<=array[h]){ //[l,m] 是旋转数组 + h = m; + }else{ //[m+1,h] 是旋转数组 + l =m+1; + } + } + return array[l]; + } + + + + @Test + public void test(){ + int[] nums={1,3,4,5}; + System.out.println(minNumberInRotateArray(nums)); + } +} diff --git "a/docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java" "b/docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java" new file mode 100644 index 0000000..88414c4 --- /dev/null +++ "b/docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java" @@ -0,0 +1,43 @@ +import org.junit.Test; + +/** + * Created by 18351 on 2019/7/22. + */ +public class 替换空格_Important { + public String replaceSpace(StringBuffer str) { + //P1 指向原来的 + //令 P1 指向字符串原来的末尾位置, + // P2 指向字符串现在的末尾位置。 + int P1 = str.length() - 1; + // ' ' 要转化为 '%20' 是需要额外的 2 个字符的位置 + for(int i=0;i<=p1;i++){ + char ch = str.charAt(i); + if(ch==' '){ + str.append(" "); + } + } + //P1 和 P2 从后向前遍历,当 P1 遍历到一个空格时, + //就需要令 P2 指向的位置依次填充 02%(注意是逆序的),否则就填充上 P1 指向字符的值。 + //从后向前遍是为了在改变 P2 所指向的内容时,不会影响到 P1 遍历原来字符串的内容。 + int P2=str.length()-1; + while(P1>=0 && P2>= P1){
+ char ch = str.charAt(P1);
+ if(ch==' '){
+ str.setCharAt(P2--,'0');
+ str.setCharAt(P2--,'2');
+ str.setCharAt(P2--,'%');
+ }else{
+ str.setCharAt(P2--,ch);
+ }
+ P1--;
+ }
+ return str.toString();
+ }
+
+ @Test
+ public void test(){
+ StringBuffer buffer = new StringBuffer();
+ buffer.append("A B C");
+ System.out.println(replaceSpace(buffer).toString());
+ }
+}
diff --git "a/docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java" "b/docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java"
new file mode 100644
index 0000000..50a4694
--- /dev/null
+++ "b/docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java"
@@ -0,0 +1,35 @@
+import java.util.Stack;
+
+/**
+ * Created by 18351 on 2019年7月23日.
+ */
+public class 用两个栈实现队列 {
+ //用两个栈实现队列
+ Stack<integer> stack1 = new Stack<integer>();
+ Stack<integer> stack2 = new Stack<integer>();
+ int front; //用来记录第一个出栈元素
+
+ public void push(int node) {
+ if (stack1.isEmpty()){
+ front = node;
+ }
+ stack1.push(node);
+ }
+
+ public int pop() {
+ if(stack2.isEmpty()){
+ while(!stack1.isEmpty()){
+ stack2.push(stack1.pop());
+ }
+ }
+ return stack2.pop();
+ }
+
+ public static void main(String[] args) {
+ 用两个栈实现队列 q = new 用两个栈实现队列();
+ q.push(1);
+ q.push(2);
+ q.push(3);
+ q.pop();
+ }
+}
diff --git "a/docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java" "b/docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java"
new file mode 100644
index 0000000..45160bf
--- /dev/null
+++ "b/docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java"
@@ -0,0 +1,37 @@
+import org.junit.Test;
+
+import java.util.WeakHashMap;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Created by 18351 on 2019年7月23日.
+ */
+public class 矩形覆盖_Important {
+ //思路:
+ //n=1 时,1 种
+ //n=2 时,2 种
+ //n=3 时,3 种
+ //n=4 时,5 种
+ //f(n) = f(n-1) + f(n-2)
+ //注意:时间复杂度
+ //使用递归的方式时间复杂度较高
+ public int RectCover(int target) {
+ if (target==1){
+ return 1;
+ }
+ if(target==2){
+ return 2;
+ }
+
+ //TODO:循环方式替代递归方式
+ int pre1 = 1;
+ int pre2 = 2;
+ int res = 0;
+ for(int i=3;i<=target;i++){ + res = pre1 + pre2; + pre1 = pre2; + pre2 = res; + } + return res; + } +} diff --git "a/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" "b/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" index 37c982c..86f084f 100644 --- "a/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" +++ "b/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" @@ -1,83 +1,6 @@ -import org.junit.Test; - /** - * Created by DHA on 2019/7/25. + * Created by 18351 on 2019/7/25. */ public class 矩阵中的路径 { - private int m,n; //矩阵的长度、宽度 - private boolean[][] visted; //标记是否访问 - - private int[][] d={ - {0,1}, //向右 - {-1,0},//向上 - {0,-1},//向左 - {1,0} //向下 - }; - - private boolean inArea(int x,int y){ - return (x>=0 && x<m) && (y>=0 && y<n); - } - - //从board[startx][starty]开始寻找word[index...word.ength()] - private boolean searchMatrix(char[][] matrix, char[] str,int index,int startx,int starty){ - if(index==str.length-1){ //递归到最后一个元素,检测是否相等 - return matrix[startx][starty] == str[index]; - } - if(matrix[startx][starty]==str[index]){ - visted[startx][starty] = true; - for(int i=0;i<4;i++){ - int newX = startx+d[i][0]; - int newY = starty+d[i][1]; - if(inArea(newX,newY) && !visted[newX][newY]){ - if(searchMatrix(matrix,str,index+1,newX,newY)){ - return true; - } - } - } - visted[startx][starty] =false; - } - return false; - } - - //构建二维矩阵 - private char[][] buildMatrix(char[] array, int rows, int cols){ - //根据char[] matrix, rows, cols 构建二维的矩阵 - char[][] matrix = new char[rows][cols]; - int index=0; - for(int i=0;i<rows;i++) { - for (int j = 0; j < cols; j++) { - matrix[i][j] = array[index++]; - } - } - return matrix; - } - - //matirx 就是字符串矩阵; - //rows 和 cols 是其长度和宽度 - public boolean hasPath(char[] array, int rows, int cols, char[] str) { - if(rows==0){ - return false; - } - char[][] matrix = buildMatrix(array,rows,cols); - - m = rows; - n = cols; - visted = new boolean[m][n]; - - for(int i=0;i<m;i++){ - for(int j=0;j<n;j++){ - if(searchMatrix(matrix,str,0,i,j)){ - return true; - } - } - } - return false; - } - @Test - public void test(){ - char[] matrix = "abcesfcsadee".toCharArray(); - char[] str="bcced".toCharArray(); - System.out.println(hasPath(matrix,3,4,str)); - } } diff --git "a/docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java" "b/docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java" new file mode 100644 index 0000000..4761874 --- /dev/null +++ "b/docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java" @@ -0,0 +1,29 @@ +import org.junit.Test; + +/** + * Created by 18351 on 2019/7/24. + */ +public class 跳台阶 { + //思路:target 是指 n 节级台阶 + //n = 1, 有 1 种跳法 + //n = 2, 有 2 种跳法 + //n = 3, 有 3 种跳法 + public int JumpFloor(int target) { + if(target<=2){ + return target; + } + int pre1 = 1; + int pre2 = 2; + for(int i=3;i<=target;i++){ + int next = pre1 + pre2; + pre1 = pre2; + pre2 = next; + } + return pre2; + } + + @Test + public void test(){ + System.out.println(JumpFloor(5)); + } +} From 8d73841b3810af5676ffd305a93c3de816cc4189 Mon Sep 17 00:00:00 2001 From: DuHouAn <18351926682@163.com>
Date: 2019年8月20日 22:08:37 +0800
Subject: [PATCH 3/4] Java-Notes
---
 ...code-Database 351円242円230円350円247円243円.md" &#124; 21 ++++++++++---------
 1 file changed, 11 insertions(+), 10 deletions(-)
diff --git "a/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md" "b/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md"
index 4597546..7d731a2 100644
--- "a/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md"	
+++ "b/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md"	
@@ -284,7 +284,7 @@ HAVING COUNT(id)>= 2;
 
 # *6、删除重复的电子邮箱(196)
 
-https://leetcode.com/problems/delete-duplicate-emails/description/
+[196. 删除重复的电子邮箱](https://leetcode-cn.com/problems/delete-duplicate-emails/)
 
 - 问题描述
 
@@ -356,7 +356,7 @@ WHERE
 
 # 7、组合两个表(175)
 
-https://leetcode.com/problems/combine-two-tables/description/
+[175. 组合两个表](https://leetcode-cn.com/problems/combine-two-tables/)
 
 - 问题描述:
 
@@ -434,7 +434,7 @@ ON p.PersonId=a.PersonId;
 
 # *8、超过经理收入的员工(181)
 
-https://leetcode.com/problems/employees-earning-more-than-their-managers/description/
+[181. 超过经理收入的员工](https://leetcode-cn.com/problems/employees-earning-more-than-their-managers/)
 
 - 问题描述:
 
@@ -504,7 +504,7 @@ FROM
 
 # 9、从不订购的客户(183)
 
-https://leetcode.com/problems/customers-who-never-order/description/
+[181. 超过经理收入的员工](https://leetcode-cn.com/problems/employees-earning-more-than-their-managers/)
 
 - 问题描述:
 
@@ -591,7 +591,7 @@ WHERE
 
 # *10、部门工资最高的员工(184)
 
-https://leetcode.com/problems/department-highest-salary/description/
+[184. 部门工资最高的员工](https://leetcode-cn.com/problems/department-highest-salary/)
 
 - 问题描述:
 
@@ -682,7 +682,7 @@ WHERE
 
 # 11、第二高的薪水(176)
 
-https://leetcode.com/problems/second-highest-salary/description/
+[176. 第二高的薪水](https://leetcode-cn.com/problems/second-highest-salary/)
 
 - 问题描述:
 
@@ -767,7 +767,7 @@ END
 
 # 13、分数排名(178)
 
-https://leetcode.com/problems/rank-scores/description/
+[177. 第N高的薪水](https://leetcode-cn.com/problems/nth-highest-salary/)
 
 - 问题描述:
 
@@ -838,6 +838,8 @@ ORDER BY
 
 # *14、连续出现的数字(180)
 
+[180. 连续出现的数字](https://leetcode-cn.com/problems/consecutive-numbers/)
+
 - 问题描述:
 
 数字表:
@@ -884,9 +886,8 @@ VALUES
 ( 7, 2 );
 ```
 
-- 解题
+- 解题:
 
-- 
 
 ```sql
 # 思路:要求是连续出现 3 次,可使用 3 张该表
@@ -930,7 +931,7 @@ WHERE L1.Num = L2.Num
 
 # 15、换座位(626)(了解)
 
-https://leetcode.com/problems/exchange-seats/description/
+[626. 换座位](https://leetcode-cn.com/problems/exchange-seats/)
 
 - 问题描述:
 
From 943332707dd9abf36e0a26369956e1ebe05815fd Mon Sep 17 00:00:00 2001
From: DuHouAn <18351926682@163.com>
Date: 2019年8月21日 21:18:07 +0800
Subject: [PATCH 4/4] Java-Notes
---
 docs/AimForOffer/MyQueue.java &#124; 56 ------------------
 docs/AimForOffer/ThreadSafeLRUCache.java &#124; 49 ----------------
 docs/AimForOffer/TreeLinkNode.java &#124; 13 -----
 docs/AimForOffer/TreeNode.java &#124; 9 ---
 ...52347円273円223円347円202円271円_Important.java" &#124; 31 ----------
 ...345円215円260円351円223円276円350円241円250円.java" &#124; 32 ----------
 ...63345円217円260円351円230円266円_Important.java" &#124; 32 ----------
 ...344円272円214円345円217円211円346円240円221円.java" &#124; 30 ----------
 ...347円232円204円346円225円260円345円255円227円.java" &#124; 27 ---------
 ...17346円225円260円345円255円227円_Important.java" &#124; 58 -------------------
 ...42347円251円272円346円240円274円_Important.java" &#124; 43 --------------
 ...345円276円205円345円244円204円347円220円206円.java" &#124; 37 ------------
 ...347円247円257円346円225円260円347円273円204円.java" &#124; 36 ------------
 ...347円216円260円351円230円237円345円210円227円.java" &#124; 35 -----------
 ...42350円246円206円347円233円226円_Important.java" &#124; 37 ------------
 ...347円232円204円350円267円257円345円276円204円.java" &#124; 6 --
 ...350円267円263円345円217円260円351円230円266円.java" &#124; 29 ----------
 ...code-Database 351円242円230円350円247円243円.md" &#124; 2 +-
 ...14345円233円236円346円272円257円346円263円225円.md" &#124; 6 +-
 19 files changed, 4 insertions(+), 564 deletions(-)
 delete mode 100644 docs/AimForOffer/MyQueue.java
 delete mode 100644 docs/AimForOffer/ThreadSafeLRUCache.java
 delete mode 100644 docs/AimForOffer/TreeLinkNode.java
 delete mode 100644 docs/AimForOffer/TreeNode.java
 delete mode 100644 "docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java"
 delete mode 100644 "docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java"
 delete mode 100644 "docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java"
 delete mode 100644 "docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java"
 delete mode 100644 "docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java"
 delete mode 100644 "docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java"
 delete mode 100644 "docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java"
 delete mode 100644 "docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java"
 delete mode 100644 "docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java"
 delete mode 100644 "docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java"
 delete mode 100644 "docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java"
 delete mode 100644 "docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java"
 delete mode 100644 "docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java"
diff --git a/docs/AimForOffer/MyQueue.java b/docs/AimForOffer/MyQueue.java
deleted file mode 100644
index 59d933c..0000000
--- a/docs/AimForOffer/MyQueue.java
+++ /dev/null
@@ -1,56 +0,0 @@
-import java.util.Stack;
-
-/**
- * Created by 18351 on 2019年7月23日.
- */
-//使用两个栈实现队列的扩展
-public class MyQueue {
- //用两个栈实现队列
- Stack<integer> stack1 = new Stack<strong>();
- Stack<integer> stack2 = new Stack<strong>();
-
- //存储队列头元素
- private int front; //方便后面的 peek() 操作
-
- /** Initialize your data structure here. */
- public MyQueue() {
- stack1 = new Stack<strong>();
- stack2 = new Stack<strong>();
- }
-
- public void push(int node) {
- if(stack1.isEmpty()){
- front = node;
- }
- stack1.push(node);
- }
-
- public int pop() {
- if(stack2.isEmpty()){
- while(!stack1.isEmpty()){
- stack2.push(stack1.pop());
- }
- }
- return stack2.pop();
- }
-
- public int peek(){
- if(stack2.isEmpty()){
- return front;
- }
- return stack2.peek();
- }
-
- public boolean empty(){
- return (stack1.isEmpty()) && (stack2.isEmpty());
- }
-
- public static void main(String[] args) {
- MyQueue queue = new MyQueue();
- queue.push(1);
- queue.push(2);
- System.out.println(queue.peek()); // 返回 1
- System.out.println(queue.pop()); // 返回 1
- queue.empty(); // 返回 false
- }
-}
diff --git a/docs/AimForOffer/ThreadSafeLRUCache.java b/docs/AimForOffer/ThreadSafeLRUCache.java
deleted file mode 100644
index b725030..0000000
--- a/docs/AimForOffer/ThreadSafeLRUCache.java
+++ /dev/null
@@ -1,49 +0,0 @@
-import org.junit.Test;
-
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-/**
- * Created by 18351 on 2019年7月25日.
- */
-public class ThreadSafeLRUCache<k, V> {
- private static final int MAX_CAPACITY = 3;
- private LinkedHashMap<k,v> linkedHashMap;
-
- public ThreadSafeLRUCache(){
- linkedHashMap = new LinkedHashMap(MAX_CAPACITY,0.75f,false){
- @Override
- protected boolean removeEldestEntry(Map.Entry eldest) {
- return size()>MAX_CAPACITY;
- }
- };
- }
-
- public synchronized void put(K k,V v){
- linkedHashMap.put(k,v);
- }
-
- public synchronized V get(K k){
- return (V)linkedHashMap.get(k);
- }
-
- @Override
- public String toString() {
- StringBuilder sb=new StringBuilder();
- for(Map.Entry<k,v> entry:linkedHashMap.entrySet())
- sb.append(String.format("%s: %s\n", entry.getKey(), entry.getValue()));
- return sb.toString();
- }
-
- @Test
- public void test(){
- ThreadSafeLRUCache<integer,string> cache=new ThreadSafeLRUCache<strong>();
- cache.put(1, "a");
- cache.put(2, "b");
- cache.put(3, "c");
- cache.get(1);
- //LRU 键值1被访问过了,则最近最久未访问的就是2
- cache.put(4, "d");
- System.out.println(cache);
- }
-}
diff --git a/docs/AimForOffer/TreeLinkNode.java b/docs/AimForOffer/TreeLinkNode.java
deleted file mode 100644
index c277e9e..0000000
--- a/docs/AimForOffer/TreeLinkNode.java
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Created by 18351 on 2019年7月23日.
- */
-public class TreeLinkNode {
- int val;
- TreeLinkNode left = null;
- TreeLinkNode right = null;
- TreeLinkNode next = null;
-
- TreeLinkNode(int val) {
- this.val = val;
- }
-}
diff --git a/docs/AimForOffer/TreeNode.java b/docs/AimForOffer/TreeNode.java
deleted file mode 100644
index c9297d8..0000000
--- a/docs/AimForOffer/TreeNode.java
+++ /dev/null
@@ -1,9 +0,0 @@
-/**
- * Created by 18351 on 2019年7月23日.
- */
-public class TreeNode {
- int val;
- TreeNode left;
- TreeNode right;
- TreeNode(int x) { val = x; }
-}
diff --git "a/docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java" "b/docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java"
deleted file mode 100644
index 7a2963c..0000000
--- "a/docs/AimForOffer/344円272円214円345円217円211円346円240円221円347円232円204円344円270円213円344円270円200円344円270円252円347円273円223円347円202円271円_Important.java"
+++ /dev/null
@@ -1,31 +0,0 @@
-import java.util.Scanner;
-
-/**
- * Created by 18351 on 2019年7月23日.
- */
-public class 二叉树的下一个结点_Important {
- //二叉树的下一个结点
- public TreeLinkNode GetNext(TreeLinkNode pNode){
- if(pNode==null){
- return null;
- }
- if(pNode.right!=null){
- //先判断 pNode 的右子树不为 null,
- //pNode 的下一个结点就是 pNode 右子树的最左结点
- TreeLinkNode node = pNode.right; //pNode 的右子树
- while(node.left!=null){
- node = node.left;
- }
- return node;
- }else{ //否则,向上找第一个左连接指向的树包含该节点的祖先节点
- while (pNode.next!=null){
- TreeLinkNode parent = pNode.next;
- if(parent.left==pNode){
- return parent;
- }
- pNode = pNode.next;
- }
- }
- return null;
- }
-}
diff --git "a/docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java" "b/docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java"
deleted file mode 100644
index c73507b..0000000
--- "a/docs/AimForOffer/344円273円216円345円260円276円345円210円260円345円244円264円346円211円223円345円215円260円351円223円276円350円241円250円.java"
+++ /dev/null
@@ -1,32 +0,0 @@
-import java.util.ArrayList;
-
-/**
- * Created by DHA on 2019年7月22日.
- */
-public class 从尾到头打印链表 {
- //从尾到头打印链表
- public ArrayList<integer> printListFromTailToHead(ListNode listNode) {
- ArrayList<integer> res = new ArrayList<strong>();
-
- //逆置该链表
- ListNode head = reverse(listNode);
- while(head!=null){
- res.add(head.val);
- head = head.next;
- }
- return res;
- }
-
- private ListNode reverse(ListNode listNode){
- ListNode pre = null;
- ListNode cur = listNode;
- while(cur!=null){
- ListNode next = cur.next;
- cur.next = pre;
-
- pre = cur;
- cur = next;
- }
- return pre;
- }
-}
diff --git "a/docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java" "b/docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java"
deleted file mode 100644
index ceaa998..0000000
--- "a/docs/AimForOffer/345円217円230円346円200円201円350円267円263円345円217円260円351円230円266円_Important.java"
+++ /dev/null
@@ -1,32 +0,0 @@
-import org.junit.Test;
-
-import java.util.Arrays;
-
-/**
- * Created by 18351 on 2019年7月24日.
- */
-public class 变态跳台阶_Important {
- //动态规划思路:
- //dp[i] 表示跳 i 阶台阶共有 dp[i] 中跳法
- public int JumpFloorII(int target) {
- int[] dp=new int[target+1];
- //dp 数组数值初始化为 1
- Arrays.fill(dp,1);
-
- for(int i=2;i<=target;i++){ - for(int j=1;j<i;j++){ //每次青蛙可跳 j 步 - dp[i] = dp[i] + dp[j]; - } - } - return dp[target]; - } - - @Test - public void test(){ - //int target = 3; - //int target = 4; - //int target = 5; - int target = 6; - System.out.println(JumpFloorII(target)); - } -} diff --git "a/docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java" "b/docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java" deleted file mode 100644 index 12b9aa7..0000000 --- "a/docs/AimForOffer/345円273円272円344円272円214円345円217円211円346円240円221円.java" +++ /dev/null @@ -1,30 +0,0 @@ -/** - * Created by 18351 on 2019/7/23. - */ -public class 重建二叉树 { - public TreeNode reConstructBinaryTree(int [] pre, int [] in) { - return reConstructBinaryTree(pre,in,0,pre.length-1,0,in.length-1); - } - - private TreeNode reConstructBinaryTree(int[] pre,int[] in, - int preStart,int preEnd, - int inStart,int inEnd){ - if(preStart>preEnd &#124;&#124; inStart>inEnd){
- return null;
- }
- TreeNode root = new TreeNode(pre[preStart]);
-
- int index = -1;
- for(int i=inStart;i<=inend;i++){ - if(in[i]==pre[preStart]){ - index = i; - break; - } - } - root.left = reConstructBinaryTree(pre,in, - preStart+1,preStart+(index-inStart),inStart,index-1); - root.right = reConstructBinaryTree(pre,in, - preStart+(index-inStart)+1,preEnd,index+1,inEnd); - return root; - } -} diff --git "a/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" "b/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" deleted file mode 100644 index 54c4855..0000000 --- "a/docs/AimForOffer/346円225円260円347円273円204円344円270円255円351円207円215円345円244円215円347円232円204円346円225円260円345円255円227円.java" +++ /dev/null @@ -1,27 +0,0 @@ -/** - * Created by 18351 on 2019/7/23. - */ -public class 数组中重复的数字 { - public boolean duplicate(int numbers[],int length,int [] duplication) { - for(int i=0;i<length;i++){ - if(numbers[i]!=numbers[numbers[i]]){ - swap(numbers,i,numbers[i]); - i--; - } - } - - for(int i=0;i<length;i++){ - if(numbers[i]!=i){ - duplication[0]=numbers[i]; - return true; - } - } - return false; - } - - private void swap(int[] nums,int i,int j){ - int tmp = nums[i]; - nums[i] = nums[j]; - nums[j] = tmp; - } -} diff --git "a/docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java" "b/docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java" deleted file mode 100644 index 3c6b80d..0000000 --- "a/docs/AimForOffer/346円227円213円350円275円254円346円225円260円347円273円204円347円232円204円346円234円200円345円260円217円346円225円260円345円255円227円_Important.java" +++ /dev/null @@ -1,58 +0,0 @@ -import org.junit.Test; - -/** - * Created by 18351 on 2019/7/25. - */ -public class 旋转数组的最小数字_Important { - //思路一: - //遍历,遇到前一个数大于后一个数,就返回后一个数 - //时间复杂度是 O(n) - public int minNumberInRotateArray_1(int [] array) { - if(array==null &#124;&#124; array.length==0){ - return 0; - } - if(array.length==1){ - return array[0]; - } - //此时数组中至少有 2 个元素 - int res = array[0]; - for(int i=1;i<array.length;i++){ - if(array[i-1]>array[i]){
- res = array[i];
- break;
- }
- }
- return res;
- }
-
- //二分查找的变形:
- //关键在于确定旋转数组在那一部分
- public int minNumberInRotateArray(int [] array) {
- if(array==null &#124;&#124; array.length==0){
- return 0;
- }
- if(array.length==1){
- return array[0];
- }
-
- int l=0;
- int h=array.length-1;
- while(l<h){ - int m = (h-l)/2+l; - if(array[m]<=array[h]){ //[l,m] 是旋转数组 - h = m; - }else{ //[m+1,h] 是旋转数组 - l =m+1; - } - } - return array[l]; - } - - - - @Test - public void test(){ - int[] nums={1,3,4,5}; - System.out.println(minNumberInRotateArray(nums)); - } -} diff --git "a/docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java" "b/docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java" deleted file mode 100644 index 88414c4..0000000 --- "a/docs/AimForOffer/346円233円277円346円215円242円347円251円272円346円240円274円_Important.java" +++ /dev/null @@ -1,43 +0,0 @@ -import org.junit.Test; - -/** - * Created by 18351 on 2019/7/22. - */ -public class 替换空格_Important { - public String replaceSpace(StringBuffer str) { - //P1 指向原来的 - //令 P1 指向字符串原来的末尾位置, - // P2 指向字符串现在的末尾位置。 - int P1 = str.length() - 1; - // ' ' 要转化为 '%20' 是需要额外的 2 个字符的位置 - for(int i=0;i<=p1;i++){ - char ch = str.charAt(i); - if(ch==' '){ - str.append(" "); - } - } - //P1 和 P2 从后向前遍历,当 P1 遍历到一个空格时, - //就需要令 P2 指向的位置依次填充 02%(注意是逆序的),否则就填充上 P1 指向字符的值。 - //从后向前遍是为了在改变 P2 所指向的内容时,不会影响到 P1 遍历原来字符串的内容。 - int P2=str.length()-1; - while(P1>=0 && P2>= P1){
- char ch = str.charAt(P1);
- if(ch==' '){
- str.setCharAt(P2--,'0');
- str.setCharAt(P2--,'2');
- str.setCharAt(P2--,'%');
- }else{
- str.setCharAt(P2--,ch);
- }
- P1--;
- }
- return str.toString();
- }
-
- @Test
- public void test(){
- StringBuffer buffer = new StringBuffer();
- buffer.append("A B C");
- System.out.println(replaceSpace(buffer).toString());
- }
-}
diff --git "a/docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java" "b/docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java"
deleted file mode 100644
index ada8700..0000000
--- "a/docs/AimForOffer/346円234円272円345円231円250円344円272円272円347円232円204円350円277円220円345円212円250円350円214円203円345円233円264円_345円276円205円345円244円204円347円220円206円.java"
+++ /dev/null
@@ -1,37 +0,0 @@
-import org.junit.Test;
-
-/**
- * Created by DHA on 2019年7月25日.
- */
-public class 机器人的运动范围 {
- private int m,n;
-
- private int[][] d={
- {0,1}, //向右
- {-1,0},//向上
- {0,-1},//向左
- {1,0} //向下
- };
-
- //获取一个数各个位上的数字相加
- private int getNum(int num){
- int sum = 0;
- while(num>0){
- sum += num %10;
- num/=10;
- }
- return sum;
- }
-
-
-
- public int movingCount(int threshold, int rows, int cols) {
-
- }
-
- @Test
- public void test(){
- int num = 37;
- System.out.println(getNum(num));
- }
-}
diff --git "a/docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java" "b/docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java"
deleted file mode 100644
index bb5acd5..0000000
--- "a/docs/AimForOffer/346円236円204円345円273円272円344円271円230円347円247円257円346円225円260円347円273円204円.java"
+++ /dev/null
@@ -1,36 +0,0 @@
-import org.junit.Test;
-
-/**
- * Created by DHA on 2019年7月22日.
- */
-public class 构建乘积数组 {
- //构建乘积数组
- //思路:
- //B[i]=A[0]*A[1]*...*A[i-1]*A[i+1]*...*A[n-1]。
- //B[i] 可拆分成 (A[0]*A[1]*...*A[i-1])*(A[i+1]*...*A[n-1])两部分
- public int[] multiply(int[] A) {
- int n = A.length;
- int[] B = new int[n];
-
- //B[i] = A[0]*A[1]*...*A[i-1]
- int product =1;
- for(int i=0;i<n;product*=a[i],i++){ - B[i] = product; - } - //B[i] = B[i] * (A[i+1]*...*A[n-1]) - product=1; - for(int i=n-1;i>=0;product*=A[i],i--){
- B[i]*= product;
- }
- return B;
- }
-
- @Test
- public void test(){
- int[] A={1,2,3,4,5};
- int[] B=multiply(A);
- for(int num:B){
- System.out.println(num);
- }
- }
-}
diff --git "a/docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java" "b/docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java"
deleted file mode 100644
index 50a4694..0000000
--- "a/docs/AimForOffer/347円224円250円344円270円244円344円270円252円346円240円210円345円256円236円347円216円260円351円230円237円345円210円227円.java"
+++ /dev/null
@@ -1,35 +0,0 @@
-import java.util.Stack;
-
-/**
- * Created by 18351 on 2019年7月23日.
- */
-public class 用两个栈实现队列 {
- //用两个栈实现队列
- Stack<integer> stack1 = new Stack<integer>();
- Stack<integer> stack2 = new Stack<integer>();
- int front; //用来记录第一个出栈元素
-
- public void push(int node) {
- if (stack1.isEmpty()){
- front = node;
- }
- stack1.push(node);
- }
-
- public int pop() {
- if(stack2.isEmpty()){
- while(!stack1.isEmpty()){
- stack2.push(stack1.pop());
- }
- }
- return stack2.pop();
- }
-
- public static void main(String[] args) {
- 用两个栈实现队列 q = new 用两个栈实现队列();
- q.push(1);
- q.push(2);
- q.push(3);
- q.pop();
- }
-}
diff --git "a/docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java" "b/docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java"
deleted file mode 100644
index 45160bf..0000000
--- "a/docs/AimForOffer/347円237円251円345円275円242円350円246円206円347円233円226円_Important.java"
+++ /dev/null
@@ -1,37 +0,0 @@
-import org.junit.Test;
-
-import java.util.WeakHashMap;
-import java.util.concurrent.ConcurrentHashMap;
-
-/**
- * Created by 18351 on 2019年7月23日.
- */
-public class 矩形覆盖_Important {
- //思路:
- //n=1 时,1 种
- //n=2 时,2 种
- //n=3 时,3 种
- //n=4 时,5 种
- //f(n) = f(n-1) + f(n-2)
- //注意:时间复杂度
- //使用递归的方式时间复杂度较高
- public int RectCover(int target) {
- if (target==1){
- return 1;
- }
- if(target==2){
- return 2;
- }
-
- //TODO:循环方式替代递归方式
- int pre1 = 1;
- int pre2 = 2;
- int res = 0;
- for(int i=3;i<=target;i++){ - res = pre1 + pre2; - pre1 = pre2; - pre2 = res; - } - return res; - } -} diff --git "a/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" "b/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" deleted file mode 100644 index 86f084f..0000000 --- "a/docs/AimForOffer/347円237円251円351円230円265円344円270円255円347円232円204円350円267円257円345円276円204円.java" +++ /dev/null @@ -1,6 +0,0 @@ -/** - * Created by 18351 on 2019/7/25. - */ -public class 矩阵中的路径 { - -} diff --git "a/docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java" "b/docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java" deleted file mode 100644 index 4761874..0000000 --- "a/docs/AimForOffer/350円267円263円345円217円260円351円230円266円.java" +++ /dev/null @@ -1,29 +0,0 @@ -import org.junit.Test; - -/** - * Created by 18351 on 2019/7/24. - */ -public class 跳台阶 { - //思路:target 是指 n 节级台阶 - //n = 1, 有 1 种跳法 - //n = 2, 有 2 种跳法 - //n = 3, 有 3 种跳法 - public int JumpFloor(int target) { - if(target<=2){ - return target; - } - int pre1 = 1; - int pre2 = 2; - for(int i=3;i<=target;i++){ - int next = pre1 + pre2; - pre1 = pre2; - pre2 = next; - } - return pre2; - } - - @Test - public void test(){ - System.out.println(JumpFloor(5)); - } -} diff --git "a/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md" "b/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md" index 7d731a2..c3d52b5 100644 --- "a/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md" +++ "b/docs/DataBase/09Leetcode-Database 351円242円230円350円247円243円.md" @@ -767,7 +767,7 @@ END # 13、分数排名(178) -[177. 第N高的薪水](https://leetcode-cn.com/problems/nth-highest-salary/) +[178. 分数排名](https://leetcode-cn.com/problems/rank-scores/) - 问题描述: diff --git "a/docs/LeetCode/06351円200円222円345円275円222円345円222円214円345円233円236円346円272円257円346円263円225円.md" "b/docs/LeetCode/06351円200円222円345円275円222円345円222円214円345円233円236円346円272円257円346円263円225円.md" index 676d5f8..c47219a 100644 --- "a/docs/LeetCode/06351円200円222円345円275円222円345円222円214円345円233円236円346円272円257円346円263円225円.md" +++ "b/docs/LeetCode/06351円200円222円345円275円222円345円222円214円345円233円236円346円272円257円346円263円225円.md" @@ -43,7 +43,7 @@ s(digits)是digits所能代表的字母字符串 letter(digits[i])是digits[i]所能代表的字母 s(digits[0...n-1]) - + = letter(digits[0]) + s(digits[1...n-1]) = letter(digits[0]) + letter(digits[1]) + s(digits[2...n-1]) @@ -365,7 +365,7 @@ Explanation: The graph looks like this: 这里面graph是使用的二维数组表示的,[[1,2], [3], [3], []]可以使用矩阵这样表示 
- 
+
 ```java
 private List<list<integer>> res;
 /**
@@ -1719,5 +1719,5 @@ private boolean canPartition(int[] nums,int[] sums,int k,int index,int target){
 return false;
 }
 ```
- 
+
 ## 其他递归问题
\ No newline at end of file
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