제출 #520693

#제출 시각아이디문제언어결과실행 시간메모리
520693sidon세 명의 친구들 (BOI14_friends)C++17
100 / 100
57 ms4612 KiB
#include <bits/stdc++.h> using namespace std; string s; int n, p; bool match(int i, int j) { for(int k = p = 0; k <= n; k++) p += p < n && s[i+p] == s[j+k]; return p == n; } int main() { cin >> n >> s; s += '$'; bool L = match(0, n/=2), R = match(n+1, 0); if((!L && !R) || size(s) & 1) return !(cout << "NOT POSSIBLE"); if(L && R && !match(0, n+1)) cout << "NOT UNIQUE"; else cout << s.substr(R*(n+1), n); }
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