Submission #42602

#	Time	Username	Problem	Language	Result	Execution time	Memory
42602		Hassoony	Three Friends (BOI14_friends)	C++14	100 / 100	101 ms	7728 KiB

friends

#include<bits/stdc++.h>
#include<unordered_map>
#define F first
#define S second
using namespace std;
typedef long long ll;
typedef long double D;
const ll inf=(1ll<<61);
const ll mod=1e9+7;
const int MX=1309;
int n,sum;
string s,ret,s1,s2;
int main(){
    cin>>n>>s;
    if(n%2==0){
        puts("NOT POSSIBLE");
        return 0;
    }
    for(int i=0;i<n/2;i++)s1+=s[i];
    for(int i=n/2+1;i<n;i++)s2+=s[i];
    if(s1==s2){
        cout<<s1<<endl;
        return 0;
    }
    int f1=0,f2=0,j=0;
    for(int i=0;i<n;i++){
        if(s[i]==s1[j])j++;
        if(j==n/2){
            f1++;
            j=0;
        }
    }
    j=0;
    for(int i=0;i<n;i++){
        if(s[i]==s2[j])j++;
        if(j==n/2){
            f2++;
            j=0;
        }
    }
    if(f1==2&&f2==2){
        puts("NOT UNIQUE");
        return 0;
    }
    if(f1==2){
        cout<<s1<<endl;
        return 0;
    }
    if(f2==2){
        cout<<s2<<endl;
        return 0;
    }
    puts("NOT POSSIBLE");
}

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