Submission #1269508

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269508		lekyanh	Three Friends (BOI14_friends)	C++20	100 / 100	40 ms	10168 KiB

friends

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll dem=0;
void solve(string sub, string s){
	sub=sub+sub;
	ll i=0, j=0, d=0;
	char e;
	while(i<sub.size()&&j<s.size()){
		if(sub[i]!=s[j]){
			d++;
			e=s[j];
			i--;
		}
		i++;
		j++;
		if(d>=2){
			return ;
		}
	}
	dem++;
}
ll i, j, n, dem2, kq=0;
string s, s1, s2, sub1="", sub2="";
int main(){
	cin>>n;
	cin.ignore();
	getline(cin, s);
	if(s.size()%2==0){
		cout<<"NOT POSSIBLE";
		return 0;
	}
	for(i=0; i<s.size()/2; i++){
		s1+=s[i];
	}
	for(i=s.size()/2+1; i<s.size(); i++){
		s2+=s[i];
	}
	if(s1==s2){
		solve(s1, s);
		if(dem==1) cout<<s1;
		else cout<<"NOT POSSIBLE";
	}
	else{
		solve(s1, s);
		kq+=dem;
		if(dem!=0) sub1=s1;
		dem=0;
		solve(s2, s);
		kq+=dem;
		if(dem!=0) sub2=s2;
		if(kq==2) cout<<"NOT UNIQUE";
		else if(kq==0) cout<<"NOT POSSIBLE";
		else{
			if(sub1=="") cout<<s2;
			else cout<<s1;
		}
	}
}
//abcdefghg

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