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Commit cc23247

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Merge pull request #291 from hellomrsun/master
Add C# solutions
2 parents 8034524 + fbdd550 commit cc23247

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34 files changed

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-0
lines changed

34 files changed

+718
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lines changed
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namespace _1290_Convert_Binary_Number_in_a_Linked_List_to_Integer
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{
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public class Solution
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{
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public int GetDecimalValue(ListNode head)
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{
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//Solution 1
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var res = 0;
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while (head != null)
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{
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res = res * 2 + head.val;
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head = head.next;
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}
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return res;
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//Solution 2: Stack, from end to beginning
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/*
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var stack = new Stack<int>();
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while(head != null){
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stack.Push(head.val);
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head = head.next;
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}
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var res = 0;
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var lvl = 1;
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res += stack.Pop();
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while(stack.Count > 0){
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lvl *= 2;
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res += lvl * stack.Pop();
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}
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return res;
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*/
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}
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}
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public class ListNode
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{
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public int val;
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public ListNode next;
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public ListNode(int val = 0, ListNode next = null)
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{
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this.val = val;
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this.next = next;
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}
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}
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}
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namespace _147_Insertion_Sort_List
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{
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public class Solution
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{
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public ListNode InsertionSortList(ListNode head)
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{
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ListNode dummy = new ListNode(0);
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ListNode prev = dummy;
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while (head != null)
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{
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ListNode temp = head.next;
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/* Before insert, the prev is at the last node of the sorted list.
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Only the last node's value is larger than the current inserting node
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should we move the temp back to the head*/
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if (prev.val >= head.val) prev = dummy;
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while (prev.next != null && prev.next.val < head.val)
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{
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prev = prev.next;
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}
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head.next = prev.next;
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prev.next = head;
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// prev = dummy; // Don't set prev to the head of the list after insert
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head = temp;
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}
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return dummy.next;
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}
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}
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public class ListNode
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{
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public int val;
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public ListNode next;
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public ListNode(int val = 0, ListNode next = null)
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{
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this.val = val;
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this.next = next;
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}
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}
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}
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using System;
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namespace _1446_Consecutive_Characters
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{
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public class Solution
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{
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public int MaxPower(string s)
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{
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int res = 1, cnt = 1;
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for (int i = 1; i < s.Length; i++)
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{
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if (s[i] == s[i - 1])
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{
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cnt++;
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res = Math.Max(res, cnt);
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}
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else
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{
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cnt = 1;
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}
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}
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return res;
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}
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}
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}

‎November-LeetCoding-Challenge/04-Minimum-Height-Trees/Minimum-Height-Trees.cs

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public class Solution {
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public int MinCostToMoveChips(int[] position) {
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int even = 0, odd = 0;
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for(int i=0; i<position.Length; i++){
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if(position[i] % 2 == 0){
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even++;
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}else{
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odd++;
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}
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}
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return Math.Min(even, odd);
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}
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}

‎November-LeetCoding-Challenge/06-Find-the-Smallest-Divisor-Given-a-Threshold/Find-the-Smallest-Divisor-Given-a-Threshold.cs

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using System.Collections.Generic;
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namespace _445_Add_Two_Numbers_II
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{
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public class Solution
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{
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public ListNode AddTwoNumbers(ListNode l1, ListNode l2)
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{
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Stack<int> s1 = new Stack<int>(), s2 = new Stack<int>();
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while (l1 != null)
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{
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s1.Push(l1.val);
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l1 = l1.next;
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}
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while (l2 != null)
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{
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s2.Push(l2.val);
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l2 = l2.next;
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}
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var sum = 0;
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var node = new ListNode(0);
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while (s1.Count > 0 || s2.Count > 0)
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{
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if (s1.Count > 0) sum += s1.Pop();
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if (s2.Count > 0) sum += s2.Pop();
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node.val = sum % 10;
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var head = new ListNode(sum / 10);
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head.next = node;
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node = head;
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sum /= 10;
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}
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return node.val == 0 ? node.next : node;
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}
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}
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public class ListNode
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{
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public int val;
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public ListNode next;
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public ListNode(int val = 0, ListNode next = null)
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{
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this.val = val;
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this.next = next;
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}
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}
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}
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using System;
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namespace _563_Binary_Tree_Tilt
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{
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public class Solution
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{
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private int diff = 0;
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public int FindTilt(TreeNode root) {
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PostOrder(root);
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return diff;
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}
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private int PostOrder(TreeNode node){
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if(node == null) return 0;
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var l = PostOrder(node.left);
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var r = PostOrder(node.right);
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diff += Math.Abs(l - r);
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return l + r + node.val;
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}
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}
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public class TreeNode {
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public int val;
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public TreeNode left;
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public TreeNode right;
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public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
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this.val = val;
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this.left = left;
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this.right = right;
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}
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}
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}
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using System;
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namespace _1026_Maximum_Difference_Between_Node_and_Ancestor
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{
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public class Solution
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{
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public int MaxAncestorDiff(TreeNode root)
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{
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return Dfs(root, root.val, root.val);
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}
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public int Dfs(TreeNode node, int min, int max)
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{
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if (node == null) return max - min;
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min = Math.Min(min, node.val);
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max = Math.Max(max, node.val);
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return Math.Max(Dfs(node.left, min, max), Dfs(node.right, min, max));
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}
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}
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public class TreeNode
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{
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public int val;
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public TreeNode left;
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public TreeNode right;
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public TreeNode(int val = 0, TreeNode left = null, TreeNode right = null)
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{
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this.val = val;
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this.left = left;
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this.right = right;
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}
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}
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}
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namespace _832_Flipping_an_Image
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{
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public class Solution
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{
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public int[][] FlipAndInvertImage(int[][] A) {
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if(A == null || A.Length == 0) return new int[0][];
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var levelLength = A[0].Length-1;
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int b =0;
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int e = levelLength;
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for(int i=0; i<=A.Length-1; i++){
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b = 0;
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e = levelLength;
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while(b < e){
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int temp = A[i][b];
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A[i][b] = A[i][e];
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A[i][e] = temp;
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b++;
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e--;
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}
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for(int j=0; j<=levelLength; j++){
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A[i][j] = 1 - A[i][j];
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}
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}
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return A;
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}
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}
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}

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