随机生成数组

用随机数给一个二维数组赋值要求不能有重复的数据

方法一：

 1 #include <stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 int main()
 5 {
 6     srand((unsigned)time(NULL));
 7     int arr[100];
 8     for (int i = 0; i < 100; i++)
 9     {
10         arr[i] = rand() % 200;
11         for (int j = 0; j <i; j++)
12         {
13             if (arr[j]==arr[i])
14             {
15                 --i;
16                 break;
17             }
18         }
19     }
20     for (int i = 0; i < 100; i++)
21     {
22         printf("%d	", arr[i]);
23     }
24     getchar();
25     return 0;
26 }

方法二：

 1 #include <stdio.h>
 2 #include<stdlib.h>
 3 #include<time.h>
 4 int main()
 5 {
 6     srand((unsigned)time(NULL));
 7     int arr[100];
 8     for (int i = 0; i < 100; i++)
 9     {
10         arr[i] = i;
11     }
12     int temp, m;
13     for (int j = 99; j > 0; j--)
14     {
15         m = rand() % j;
16         temp = arr[j];
17         arr[j] = arr[m];
18         arr[m] = temp;
19     }
20     for (int i = 0; i < 100; i++)
21     {
22         printf("%d	", arr[i]);
23     }
24     getchar();
25     return 0;
26 }