Submission

Score: 100

User: SnowAveNode

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.003 second

Submitted On: 2025-09-19 23:11:14

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

int main() {
    cin.tie(nullptr) -> sync_with_stdio(false);
    string s; cin >> s;
    set<char> seen, dup;
    for (char c : s) if (!seen.insert(c).second) dup.insert(c);
    for (char c : dup) seen.erase(c);
    cout << *seen.begin();
}