Submission

Score: 30

User: patsa_v

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-06 11:50:54

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

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

    char ans;
    int n = s.length();
    vector<bool> v(n+5,true);

    for(int i=0;i<n-1;i++){
        for(int j=i+1;j<n;j++){
            if(s[i] == s[j]){
                v[i] = false;
                v[j] = false;
            }
        }
    }

    for(int i=0;i<n;i++){
        if(v[i]){
            cout << s[i];
            return 0;
        }
    }
    return 0;
}