Pat 1093 字符串A+B

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string a;
    string b;
    int ht[300]={0};
    //memset(ht,0,sizeof(ht));
    getline(cin,a);
    getline(cin,b);
    string c = a+b;
    for(int i=0; i<c.length(); ++i){
        if(ht[c[i]] == 0)
        {
            cout<<c[i];
            ht[c[i]]++;
        }
    }
    cout<<endl;
    return 0;
}