PAT Basic 1093 strings A + B (20 minutes)

Given two strings  A and  B, this question requires you to output  A + B, i.e., the union of two strings. Required to output  A, then the output  B, but is repeated characters must be rejected.

Input formats:

Input respectively given in two rows  A and  B, are no longer than  1, seen from the ASCII character (i.e. code values 32 to 126) and spaces, the end of the non-identified by a carriage return empty string.

Output formats:

Requested output issues surface in a line  of A and  B and.

Sample input:

This is a sample test
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Sample output:

This ampletowyu_Hrk


String search method to

#include <iostream>
using namespace std;
int main()
{
    string a,b,ans="";
    getline(cin,a);
    getline(cin,b);
    for(int i=0;i<a.length();i++)
        if(ans.find(a[i])==ans.npos)ans+=a[i];
    for(int i=0;i<b.length();i++)
        if(ans.find(b[i])==ans.npos)ans+=b[i];
    cout<<ans;
    system("pause");
    return 0;
}