分数 20

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作者 CHEN, Yue

单位 浙江大学

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.

代码长度限制

16 KB

时间限制

100 ms

内存限制

64 MB

#include<bits/stdc++.h>
using namespace std;
string s,ss,res;
map<char,int>mp;
int main(){
    getline(cin,s);
    getline(cin,ss);
    for(int i=0;i<ss.size();i++)mp[ss[i]]=1;
    for(int i=0;i<s.size();i++)
        if(!mp[s[i]])res+=s[i];
    cout<<res<<endl;
    return 0;
}