Submission

Score: 100

User: letdown

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.003 second

Submitted On: 2025-10-07 14:23:03

#include <bits/stdc++.h>

using namespace std;

int main() {
    string s, nodupe="";
    int freq[26];
    for (int i = 0; i < 26; i++) freq[i] = 0;
    cin >> s;

    for (int i = 0; i < s.length(); i++) {
        freq[s[i] - 'A'] += 1;
    }
    for (int i = 0; i < s.length(); i++) {
        if (freq[s[i] - 'A'] == 1) nodupe += s[i];
    }
    
    int mn = 'Z';
    for (int i = 0; i < nodupe.length(); i++) {
        if (nodupe[i] < mn) mn = nodupe[i];
    }
    cout << char(mn);
}