题解 | #字符集合#22行解决

#include <iostream>
using namespace std;

int main ()
{
            string s;
    while(cin>>s)
    {
    int arr[200]={0};
    for (int i=0;i<s.size();i++)
    {
        int index=s[i]-'A';
        if (arr[index]==0)
        {
            arr[index]++;
            cout<<s[i];
        }
    }
        cout<<endl;
    }
    
}