Submission #316023

#	Time	Username	Problem	Language	Result	Execution time	Memory
316023		sofapuden	Three Friends (BOI14_friends)	C++14	100 / 100	103 ms	8336 KiB

friends

#include <bits/stdc++.h>

using namespace std;

vector<string> ans;

void tr(string a, string b){
	int cn[3];
	cn[0] = cn[1] = cn[2] = 0;
	while(cn[0] < (int)a.size() && cn[1] < (int)b.size()){
		if(a[cn[0]] == b[cn[1]]){cn[0]++, cn[1]++;}
		else{cn[2]++; cn[1]++;}
	}
	if(cn[2] > 1)return;
	if(ans.empty()){ans.push_back(a);return;}
	if(ans[0] != a){ans.push_back(a);return;}
}
	

int main(){
	int n; cin >> n;
	string s; cin >> s;
	if(!(n&1)){cout << "NOT POSSIBLE\n";return 0;}
	n/=2;
	tr(s.substr(0,n),s.substr(n,n+1));
	tr(s.substr(n+1,n), s.substr(0,n+1));
	
	if(ans.empty()){cout << "NOT POSSIBLE\n";return 0;}
	if(ans.size() == 1){cout << ans[0] << "\n"; return 0;}
	cout << "NOT UNIQUE\n";
	
}

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