Submission #107068

#	Time	Username	Problem	Language	Result	Execution time	Memory
107068		Pajaraja	Three Friends (BOI14_friends)	C++17	100 / 100	133 ms	6304 KiB

friends

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	string s;
	cin>>n>>s;
	if(n%2==0) {cout<<"NOT POSSIBLE"; return 0;}
	int p=n/2;
	bool sm=true;
	for(int i=0;i<p;i++) if(s[i]!=s[p+1+i]) sm=false;
	int tp=0,td=0;
	for(int i=0;i<p && tp<=1;i++) while(s[i]!=s[i+p+tp] && tp<=1) tp++;
	for(int i=n-1;i>=n-p && td<=1;i--) while(s[i]!=s[i-p-td] && td<=1) td++;
	if(sm) {for(int i=0;i<p;i++) cout<<s[i]; return 0;}
	if(tp>1 && td>1) {cout<<"NOT POSSIBLE"; return 0;}
	if(tp<=1 && td<=1) {cout<<"NOT UNIQUE"; return 0;}
	if(td>1) {for(int i=0;i<p;i++) cout<<s[i]; return 0;}
	for(int i=p+1;i<n;i++) cout<<s[i];
}

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