1093 String A+B (20)

Given two strings A and B, this question requires you to output A+B, which is the union of the two strings. It is required to output A first, and then output B, but repeated characters must be removed .

Input format:

Input A and B are respectively given in two lines, both of which are non-empty character strings whose length does not exceed 106, are composed of visible ASCII characters (that is, the code value is 32~126) and spaces, and are terminated by a carriage return.

Output format:

Output the sum of A and B required by the title on one line.

Input sample:

This is a sample test
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Sample output:

This ampletowyu_Hrk

The key point of the topic is to eliminate repeated characters . First, declare a string variable c to connect a and b together, and then output the same characters only once.

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int vis[127] = {};
    string a,b;
    getline(cin,a);
    getline(cin,b);
    string s = a+b;
    for(auto x : s){//能访问字符x对应的下标
        if(vis[x]==0){
            cout<<x;//保证相同的字符只输出一次
            vis[x] = 1;
        }
    }
    return 0;
}