Submission

Score: 100

User: Boeing12345

Problemset: ตัวอักษรตัวแรกในคำ

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-24 14:26:27

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
using namespace std;
int main(){
    string a;
    vector<char> v;
    cin >> a;
    if(a.length() <= 20){
     for(size_t i = 0; i < a.length(); i++){
     int A = count(a.begin(), a.end(), a[i]);
     if(A <= 1){
        v.push_back(a[i]);
       }
     }
     sort(v.begin(), v.end());
     cout << v[0];
    }
}