C语言 · 新建Microsoft Word文档

 1 #include<stdio.h>
 2 #include<string.h>
 3 #include<ctype.h> 
 4 int main()
 5 {
 6     int n;
 7     int vis[3000];
 8     char str[20];
 9     scanf("%d", &n);
10     getchar();
11     memset(vis, 0, sizeof(vis));
12     while(n--){
13         gets(str);
14         if(str[0]==‘N‘){
15             int i = 1;
16             while(1){
17                 if(vis[i]==0){
18                     printf("%d\n", i);
19                     vis[i] = 1;
20                     break;
21                 }
22                 i++;
23             }
24         }
25         else if(str[0]==‘D‘){
26             int j = str[7]-‘0‘;
27             int k = 8;
28             while(isdigit(str[k])){//判断字符串是否为数字 
29                 j = j*10+str[k]-‘0‘;
30                 k++;
31             }
32             if(vis[j]==1){
33                 vis[j]=0;
34                 printf("Successful\n");
35             }
36             else{
37                 printf("Failed\n");
38             }
39         }
40     }
41     return 0;
42 }