C语言 · 新建Microsoft Word文档

#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
int n;
int vis[];
char str[];
scanf("%d", &n);
getchar();
memset(vis, , sizeof(vis));
while(n--){
gets(str);
if(str[]=='N'){
int i = ;
while(){
if(vis[i]==){
printf("%d\n", i);
vis[i] = ;
break;
}
i++;
}
}
else if(str[]=='D'){
int j = str[]-'';
int k = ;
while(isdigit(str[k])){//判断字符串是否为数字
j = j*+str[k]-'';
k++;
}
if(vis[j]==){
vis[j]=;
printf("Successful\n");
}
else{
printf("Failed\n");
}
}
}
return ;
}