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Commit 8be328f

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author
junl
committed
修改部分文档
1 parent fe41b12 commit 8be328f

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22 files changed

+1425
-128
lines changed

22 files changed

+1425
-128
lines changed

‎ADT/main.cpp‎

Lines changed: 31 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,31 @@
1+
//
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// main.cpp
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// ADT
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//
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// Created by junl on 2020年7月14日.
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// Copyright © 2020 junl. All rights reserved.
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//
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#include <iostream>
10+
#include "max_priority_queue.h"
11+
int main(int argc, const char * argv[]) {
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// insert code here...
13+
std::cout << "Hello, World!\n";
14+
max_priority_queue queue(4);
15+
queue.insert(1);
16+
printf("max = %d\n", queue.max());
17+
queue.insert(7);
18+
printf("max = %d\n", queue.max());
19+
queue.insert(3);
20+
printf("max = %d\n", queue.max());
21+
queue.insert(5);
22+
printf("max = %d\n", queue.max());
23+
int v ;
24+
v = queue.remove_max();
25+
printf("before max = %d, now max = %d\n",v, queue.max());
26+
v = queue.remove_max();
27+
printf("before max = %d, now max = %d\n",v, queue.max());
28+
v = queue.remove_max();
29+
printf("before max = %d, now max = %d\n",v, queue.max());
30+
return 0;
31+
}

‎ADT/max_priority_queue.h‎

Lines changed: 80 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
1+
//
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// max_priority_queue.h
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// ADT
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//
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// Created by junl on 2020年7月14日.
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// Copyright © 2020 junl. All rights reserved.
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//
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#ifndef max_priority_queue_h
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#define max_priority_queue_h
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/*
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优先级队列是基于二叉堆来实现的。 二叉堆是什么? 它是一种特殊的二叉树(完全二叉树),只不过一般存储在数组里面.
14+
二叉堆有大顶堆和小顶堆. 大顶堆就是说根节点比子节点都大,这对应到优先级队列就是arr[1] 一定是所有元素中最大的元素. 小顶堆同理.
15+
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要维持二叉堆的这样结构,我们需要sink下沉和上浮swim操作,它们的目的是为了维护二叉堆的结构.
17+
*/
18+
class max_priority_queue{
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public:
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max_priority_queue(int cap){
21+
this->cap = cap;
22+
this->cnt = 0;
23+
this->elements = new int[cap+1];//下标0不使用
24+
}
25+
void insert(int val){
26+
if (cnt >= cap) return;
27+
elements[++cnt] = val;
28+
swim(cnt);
29+
}
30+
int remove_max(){
31+
if (cnt == 0) return -1;
32+
int max = elements[1];
33+
std::swap(elements[1], elements[cnt]);
34+
cnt--;
35+
sink(1);
36+
return max;
37+
}
38+
int max(){
39+
if (cnt == 0) return -1;
40+
return elements[1];
41+
}
42+
private:
43+
//获取左节点下标
44+
int left(int idx){
45+
return 2 * idx;
46+
}
47+
//获取右节点下标
48+
int right(int idx){
49+
return 2 * idx + 1;
50+
}
51+
int parent(int idx){
52+
return idx / 2;
53+
}
54+
//下沉操作
55+
void sink(int idx){
56+
int leftidx;
57+
while ((leftidx = left(idx)) < cnt) {
58+
//获取左右节点中的最大值
59+
if (leftidx+1 < cnt && elements[leftidx] < elements[leftidx+1])
60+
leftidx++;
61+
if (elements[leftidx] <= elements[idx])
62+
break;
63+
std::swap(elements[idx], elements[leftidx]);
64+
idx = leftidx;
65+
}
66+
}
67+
//上浮操作
68+
void swim(int idx){
69+
int parentidx;
70+
while((parentidx = parent(idx)) >= 1 && elements[idx] > elements[parentidx]){
71+
std::swap(elements[idx], elements[parentidx]);
72+
idx = parentidx;
73+
}
74+
}
75+
int cap;//容量
76+
int cnt;//当前数据个数
77+
int *elements;//存储地址
78+
};
79+
80+
#endif /* max_priority_queue_h */

‎alg-cpp.xcodeproj/project.pbxproj‎

Lines changed: 95 additions & 2 deletions
Original file line numberDiff line numberDiff line change
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282+
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@@ -804,6 +824,15 @@
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805825
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806826
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827+
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828+
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829+
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830+
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831+
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832+
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833+
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834+
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835+
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809838
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@@ -1049,6 +1078,7 @@
10491078
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10501079
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10511080
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1081+
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10521082
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10531083
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@@ -1073,6 +1103,7 @@
10731103
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10751105
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1106+
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10761107
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10771108
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10781109
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@@ -1301,6 +1332,23 @@
13011332
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13021333
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13031334
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1335+
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1336+
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1337+
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1339+
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1340+
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1341+
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1342+
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1343+
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1344+
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1345+
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1346+
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1347+
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1348+
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1349+
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1350+
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1351+
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13041352
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13051353
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13061354
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@@ -1526,6 +1574,9 @@
15261574
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15271575
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15281576
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1577+
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1578+
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1579+
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15291580
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15301581
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15311582
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@@ -1592,6 +1643,7 @@
15921643
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1646+
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15961648
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16301682
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16311683
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1684+
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1690+
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16321692
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16341694
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@@ -1812,6 +1872,26 @@
18121872
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18131873
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18141874
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1875+
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1879+
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1881+
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1882+
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1883+
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1885+
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1890+
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1891+
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1892+
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1893+
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1894+
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18151895
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@@ -1855,18 +1935,22 @@
18551935
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18561936
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18571937
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1938+
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18581939
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1940+
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18601941
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1942+
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18611943
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18621944
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18641946
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1949+
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1951+
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1953+
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18701954
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18711955
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@@ -2192,6 +2276,15 @@
21922276
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21932277
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2279+
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2285+
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2286+
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2287+
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21952288
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21962289
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21972290
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‎alg-cpp.xcodeproj/xcuserdata/junl.xcuserdatad/xcschemes/xcschememanagement.plist‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,11 @@
44
<dict>
55
<key>SchemeUserState</key>
66
<dict>
7+
<key>ADT.xcscheme_^#shared#^_</key>
8+
<dict>
9+
<key>orderHint</key>
10+
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11+
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‎alg-cpp.xcodeproj/xcuserdata/junlongj.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist‎

Lines changed: 3 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -42,13 +42,11 @@
4242
ignoreCount = "0"
4343
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4444
filePath = "tree/main.cpp"
45-
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45+
timestampString = "614963717.443692"
4646
startingColumnNumber = "9223372036854775807"
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48+
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49+
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5250
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‎alg-cpp.xcodeproj/xcuserdata/junlongj.xcuserdatad/xcschemes/xcschememanagement.plist‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,11 @@
44
<dict>
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<key>SchemeUserState</key>
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7+
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