Submission #930689

#	Time	Username	Problem	Language	Result	Execution time	Memory
930689		LCJLY	Three Friends (BOI14_friends)	C++14	100 / 100	14 ms	6400 KiB

friends

#include <bits/stdc++.h>
using namespace std;

#define int long long 
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
typedef pair<int,char>pi2;

void solve(){
	int n;
	cin >> n;
	string s;
	cin >> s;
	
	if(n%2==0){
		cout << "NOT POSSIBLE\n";
		return;
	}
	//front
	string cur="";
	for(int x=0;x<n/2;x++){
		cur.push_back(s[x]);
	}
	//show(cur,cur);
	int ptr=0;
	for(int x=n/2;x<n;x++){
		if(ptr<n/2&&s[x]==cur[ptr]) ptr++;
	}
	
	int check=0;	
	if(ptr==n/2){
		check=1;
	}
	
	string cur2="";
	for(int x=n/2+1;x<n;x++){
		cur2.push_back(s[x]);
	}
	ptr=0;
	for(int x=0;x<n/2+1;x++){
		if(ptr<n/2&&s[x]==cur2[ptr]) ptr++;
	}
	if(ptr==n/2){
		check+=2;
	}
	if(check==1){
		cout << cur;
	}
	else if(check==2){
		cout << cur2;
	}
	else if(check==3&&cur==cur2){
		cout << cur;
	}
	else if(check==3){
		cout << "NOT UNIQUE\n";
	}
	else cout << "NOT POSSIBLE\n";
}

int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

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