Submission #944684

#	Time	Username	Problem	Language	Result	Execution time	Memory
944684		tamir1	Three Friends (BOI14_friends)	C++17	35 / 100	1049 ms	7204 KiB

friends

#include<bits/stdc++.h>
#define ll long long
using namespace std;
ll n,i,j,cnt,ans;
string t,u,s;
bool check(string s){
	ll n=s.size(),i;
	for(i=0;i<n/2;i++){
		if(s[i]!=s[i+n/2]) return 0;
	}
	return 1;
}
int main(){
	cin >> n >> u;
	if(n%2==0){
		cout << "NOT POSSIBLE";
		return 0;
	}
	for(i=0;i<n;i++){
		t.clear();
		for(j=0;j<n;j++){
			if(j==i) continue;
			t=t+u[j];
		}
		if(check(t)){
			ans=i;
			if(s!=t) cnt++;
			s=t;
		}
	}
	if(cnt==0) cout << "NOT POSSIBLE";
	else if(cnt>1) cout << "NOT UNIQUE";
	else{
		for(i=0;i<s.size()/2;i++) cout << s[i];
	}
}

Compilation message (stderr)

friends.cpp: In function 'int main()':
friends.cpp:34:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   for(i=0;i<s.size()/2;i++) cout << s[i];
      |           ~^~~~~~~~~~~

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