浙大PAT 1050题 1050. String Subtractio

#include<stdio.h>char s1[10005],s2[10005];int ascii[1005];int main(){int i;for(i=0;i<1000;i++){ascii[i]=0;}gets(s1);gets(s2);for(i=0;s2[i]!='\0';i++){ascii[s2[i]]++;}for(i=0;s1[i]!='\0';i++){if(!ascii[s1[i]]) printf("%c",s1[i]);}printf("\n");return 0;}