Submission #1269499

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269499		lekyanh	세 명의 친구들 (BOI14_friends)	C++20	0 / 100	41 ms	11112 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 ;
		}
	}
	//cout<<e<<' '<<sub<<endl;
	dem++;
	ll pos=sub.find(e);
	if(pos<sub.size()) dem++;
}
ll i, j, n, dem2;
string s, s1, s2, sub;
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];
	}
	//cout<<s1<<' '<<s2;
	solve(s1, s);
	//cout<<dem<<endl;
	sub=s1;
	if(dem>=2){
	    cout<<"NOT UNIQUE";
		return 0;
	}
	ll dem2=dem;
	solve(s2, s);
	if(dem>=2) cout<<"NOT UNIQUE";
	else if(dem==1&&dem2==1) cout<<sub;
	else if(dem==1&&dem2==0) cout<<s2;
	else cout<<"NOT POSSIBLE";
}
//abcdefghg

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