A1050. String Subtraction

Given two strings S₁ and S₂, S = S₁ - S₂ is defined to be the remaining string after taking all the characters in S₂ from S₁. Your task is simply to calculate S₁ - S₂ for any given strings. However, it might not be that simple to do it fast.

Input Specification:

Each input file contains one test case. Each case consists of two lines which gives S₁ and S₂, respectively. The string lengths of both strings are no more than 10⁴. It is guaranteed that all the characters are visible ASCII codes and white space, and a new line character signals the end of a string.

Output Specification:

For each test case, print S₁ - S₂ in one line.

Sample Input:

They are students.
aeiou

Sample Output:

Thy r stdnts.

 #include<cstdio>
 #include<iostream>
 using namespace std;
 char s1[], s2[];
 int main(){
     int hashTB[] = {,};
     gets(s1);
     gets(s2);
     for(int i = ; s2[i] != '\0'; i++)
         hashTB[s2[i]] = ;
     for(int i = ; s1[i] != '\0'; i++)
         if(hashTB[s1[i]] == )
             printf("%c", s1[i]);
     cin >> s1;
     return ;
 }