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确实,c可以,c++就不行,while(cin)就超时,while(scanf)就能过#include<stdio.h>
#include<string.h>
#define N 11
int main()
{
char s[N],p[N];
int t,i;
t=0;
strcpy(p,"-1");
while(scanf("%s",s)!=EOF)
{
for(i=0;i<t+1&&i<strlen(s)&&i<strlen(p);i++)
if(s[i]!=p[i])break;
t=i;
for(i=0;i<t;i++)
printf(" ");
printf("%s\n",s);
strcpy(p,s);
}
return 0;
}
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