Submission #1126516

#	Time	Username	Problem	Language	Result	Execution time	Memory
1126516		Muhammet	Three Friends (BOI14_friends)	C++20	100 / 100	24 ms	14056 KiB

friends

#include <bits/stdc++.h>

using namespace std;

#define SZ(s) (int)s.size()

int main(){
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n;
	string s;
	cin >> n >> s;
	if(n % 2 == 0) {
		cout << "NOT POSSIBLE";
		return 0;
	}
	bool tr = 0, tr1 = 0;
	vector <int> a(n+1,0);
	int k = 0, x = (n/2);
	string s1 = "", s2 = "";
	for(int i = 0; i < x; i++){
		s1 += s[i];
	}
	for(int i = x+1; i < n; i++){
		s2 += s[i];
	}
	for(int i = 0; i < x; i++){
		a[i] = (s[i] == s[i+x+1]);
		k += a[i];
	}
	if(k == x) tr = 1;
	for(int i = 0; i < x; i++){
		k -= a[i];
		a[i] = (s[i] == s[i+x]);
		k += a[i];
		if(k == x) tr = 1;
	}
	k = 0;
	for(int i = n-1; i > x; i--){
		a[i] = (s[i] == s[i-x-1]);
		k += a[i];
	}
	if(k == x) tr1 = 1;
	for(int i = n-1; i > x; i--){
		k -= a[i];
		a[i] = (s[i] == s[i-x]);
		k += a[i];
		if(k == x) tr1 = 1;
	}
	if(tr == tr1){
		if(tr == 0){
			cout << "NOT POSSIBLE";
		}
		else {
			if(s1 == s2) cout << s1;
			else cout << "NOT UNIQUE";
		}
		return 0;
	}
	if(tr1 == 1) cout << s2;
	else cout << s1;
}

• Subtask 1: 35 / 35
• Subtask 2: 65 / 65