Submission

Score: 100

User: vern6767

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-25 11:31:41

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    string a;
    cin >> a;
    vector<char> b;

    for (int i = 0; i < a.size(); i++) {
        if (count(a.begin(), a.end(), a[i]) == 1) {
            b.push_back(a.at(i));
        }
    } 

    sort(b.begin(), b.end());
    cout << b.front();
    return 0;
}