Submission #930630

#	Time	Username	Problem	Language	Result	Execution time	Memory
930630		yeehaw	Three Friends (BOI14_friends)	C++17	0 / 100	35 ms	3388 KiB

friends

#include <bits/stdc++.h>
using namespace std;
#define int long long
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

int32_t main(){
    ios::sync_with_stdio(0);cin.tie(0);
    int n;cin>>n;
    char a[n];
    for(int i=0;i<n;i++)cin>>a[i];
    if(n%2==0){
        cout<<"NOT POSSIBLE";
        return 0;
    }
    int in=n/2,c=0,co=2,s=1,check=0;
    for(int i=0;i<n/2;i++){
        if(a[i]==a[i+in+c]);
        else{
            if(i==0)check=1;
            i--;
            if(c==1){
                co--;
                break;
            }c++;
        }
    }
    in++;c=0;
    for(int i=0;i<n/2;i++){
        if(a[i+c]==a[i+in]);
        else{
            i--;
            if(c==1){
                s=0;
                co--;
                break;
            }c++;
        }
    }
    if(co==2&&check==0)cout<<"NOT UNIQUE";
    else if(co==0)cout<<"NOT POSSIBLE";
    else{
        if(s){
            c=0;
            for(int i=0;i<n/2;i++){
                if(a[i+c]==a[i+n/2+1])cout<<a[i+c];
                else {i--;c++;}
            }
        }else{
            c=0;
            for(int i=0;i<n/2;i++){
                if(a[i]==a[i+n/2+c])cout<<a[i];
                else {i--;c++;}
            }
        }
    }
}

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