Submission #398891

#	Time	Username	Problem	Language	Result	Execution time	Memory
398891		almosabhali	Three Friends (BOI14_friends)	C++14	0 / 100	35 ms	14064 KiB

friends

#include <bits/stdc++.h>
using namespace std;
void fast() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}
int main() {
    fast();
    int n;
    string s;
    cin>>n>>s;
    // for(char c:s) counter[c-'A']++;
    // int odd=0;
    // char index;
    // for(int i=0;i<26;i++) {
    //     odd+=(counter[i]%2);
    //     if(counter[i]%2) index=i+'A';
    // }
    // if(odd!=1) cout<<"NOT POSSIBLE\n";
    if(n%2==0) {
        cout<<"NOT POSSIBLE\n";
        return 0;
    }
    // cout<<"debug\n";
    string ans1,ans2;
    bool f=0;
    string res1,res2;
    string l,r;
    f=0;
    res1.clear();
    res2.clear();
    l=s.substr(0,n/2),r=s.substr(n/2,n/2+1);
    for(int i=0;i<n/2;i++) {
        if(l[i]!=r[i+f]) f=1;

        res1+=l[i];
        res2+=r[i+f];
    }
    ans1=(res1 == res2 ? res1 : "");

    f=0;
    res1.clear();
    res2.clear();
    l=s.substr(0,n/2+1),r=s.substr(n/2+1,n/2);
    for(int i=0;i<n/2;i++) {
        if(r[i]!=l[i+f]) f=1;
        
        res1+=r[i];
        res2+=l[i+f];
    }

    ans2=(res1 == res2 ? res1 : "");

    if(ans1.size() && ans2.size() && ans1!=ans2) cout<<"NOT UNIQUE\n";
    else if(!ans1.size() && !ans2.size()) cout<<"NOT POSSIBLE\n";
    else cout<<ans1+ans2<<'\n';
    return 0;
}

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