Submission #310565

#	Time	Username	Problem	Language	Result	Execution time	Memory
310565		sofapuden	Three Friends (BOI14_friends)	C++14	0 / 100	1062 ms	8212 KiB

friends

#include <bits/stdc++.h>

using namespace std;

int main(){
	int n; cin >> n;
	string s; cin >> s;
	if(!(n&1)){
		cout << "NOT POSSIBLE\n";
		return 0;
	}
	vector<int> am(26,0);
	for(int i = 0; i < n; ++i){
		am[s[i]-'A']++;
	}
	int tot = 0;
	char c = '?';
	for(int i = 0; i < 26; ++i){
		if(am[i]&1){tot++;c = 'A'+i;}
	}
	if(tot > 1){cout << "NOT POSSIBLE\n"; return 0;}
	int ans = 0;
	string ori;
	string s1, s2;
	for(int i = 0; i < n; ++i){
		if(s[i] == c){
			if(i >= n/2){
				s1 = s.substr(0,n/2);
			}
			else{
				s1 = s.substr(0,i);
				s1+=s.substr(i+1, n/2-i);
			}
			if(i <= n/2){
				s2 = s.substr(n/2+1,n/2);
			}
			else{
				s2 = s.substr(n/2,i-n/2);
				s2+=s.substr(i+1,n/2-(i-n/2));
			}
			if(s1 == s2){ans++;ori = s1;}
		}
		if(ans > 1){cout << "NOT UNIQUE\n";return 0;}
	}
	if(!ans){cout << "NOT POSSIBLE\n"; return 0;}
	cout << ori << "\n";
	return 0;
		
				
			
		
}

• Subtask 1: 0 / 35
• Subtask 2: 0 / 65