Submission

Score: 100

User: chypnx

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-03 16:58:40

#include <bits/stdc++.h>
using namespace std;

int main(){
    string txt;
    cin >> txt;

    sort(txt.begin(), txt.end());

    if (txt.length() == 1){
        cout << txt[0];
    } else {
        int i = 1;
        while (i < txt.length()) {
            if (txt[i] == txt[i-1]) {
                txt.erase(i-1, 2);  // ź 2 ??ǫ??
                if (i > 1) i--;     // ?????礵?ǡ?͹˹??????
            } else {
                i++;
            }
        }

        if (!txt.empty())
            cout << txt[0];
        else
            cout << "EMPTY"; // ?ѹ???ó?ź?????
    }

    return 0;
}