Educational Codeforces Round 53 (Rated for Div. 2) A. Diverse Substring

A. Diverse Substring

https://codeforces.com/problemset/problem/1073/A

여러번 볼 필요 없이 2개씩만 비교해서 다른 문자들이 나온다면 출력해주자.

#include <bits/stdc++.h>
using namespace std;
 
int n;
string s;
int main() {
    ios::sync_with_stdio(0);
    cin.tie(NULL); cout.tie(NULL);
    cin >> n >> s;
    for (int i = 0; i < n-1; i++) {
        if (s[i] != s[i + 1]) {
            cout << "YES\n" << s[i] << s[i + 1];
            exit(0);
        }
    }
    cout << "NO";
    return 0;
}