题目:1050. String Subtraction (20)
#include<stdio.h>
#include<string.h>
#define N 10005
int main()
{
char s[N],ch;
int a[300]={0},i=0,n;
gets(s);
n=strlen(s);
while((ch=getchar())!='\n')
{
a[ch]=1;
}
for(i=0;i<n;i++)
{
if(a[s[i]]==0)printf("%c",s[i]);
}
}