Submission #931241

#	Time	Username	Problem	Language	Result	Execution time	Memory
931241		PlayVoltz	Three Friends (BOI14_friends)	C++17	0 / 100	1061 ms	6876 KiB

friends

#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <iostream>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
using namespace std;

#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

int32_t main(){
	int n;
	string s, a="", b="";
	cin>>n>>s;
	for (int i=0; i<n/2; ++i)a+=s[i];
	for (int i=n-1; i>n-n/2-1; --i)b=s[i]+b;
	bool one=1, can=1, can2=1;
	int p=0;
	for (int i=0; i<1+(n-1)/2; ++i){
		if (b[p]==s[i])++p;
		else if (one)one=0;
		else {can=0;break;}
	}
	one=1;
	p=0;
	for (int i=n/2; i<n; ++i){
		if (a[p]==s[i])++p;
		else if (one)one=0;
		else {can2=0;break;}
	}
	if (can&&can2)cout<<"NOT UNIQUE";
	else if (can)cout<<b;
	else if (can2)cout<<a;
	else cout<<"NOT POSSIBLE";
}

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