1050. String Subtraction (20)

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.

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#include<iostream>#include<cstring>#include<cstdio>using namespace std;char s1[10004],s2[10004];int main(){    gets(s1);    gets(s2);    int len=strlen(s1);    for (int i=0;i<len;i++)    {        if (strchr(s2,s1[i])!=NULL)            ;        else            cout<<s1[i];    }    return 0;}