1050 String Subtraction (20 分)
#include <cstdio>
int hashtable[256] = {0};
int main(){
char str1[10010],x;
x = getchar();
int i =0;
while(x!='\n'){
str1[i++] = x;
x = getchar();
}
x = getchar();
while(x!='\n'){
hashtable[x] =1;
x = getchar();
}
for(int j =0;j<i;j++){
if(hashtable[str1[j]]!=1)printf("%c",str1[j]);
}
return 0;
}