《算法导论》插入排序

Posted 2020-10-03

2017-08-17 11:40:36

writer：pprp

最简单的插入排序，用代码实现思想

 1 #include <iostream>
 2 #include <string>
 3 #include <fstream>
 4 #include <cstring>
 5 
 6 using namespace std;
 7 const int maxn = 9999;
 8 int a[maxn];
 9 int N;
10 
11 void init()
12 {
13     memset(a,0,sizeof(a));
14     for(int i = 1 ; i <= N ; i++)
15     {
16         cin >> a[i];
17     }
18 }
19 
20 void insert_sort()
21 {
22     init();
23 
24     for(int i = 2 ; i <= N ; i++)
25     {
26         int key = a[i];
27         int j = i - 1;
28         while(j > 0 && a[j] > key)
29         {
30             a[j + 1] = a[j];
31             j--;
32         }
33 
34         a[j + 1] = key;
35     }
36 
37     for(int i = 1 ; i <= N ; i++)
38         cout << a[i] << " ";
39 }
40 
41 int main()
42 {
43     cin >> N;
44     insert_sort();
45 
46     return 0;
47 }