Submission #938196

#	Time	Username	Problem	Language	Result	Execution time	Memory
938196		Sir_Ahmed_Imran	Three Friends (BOI14_friends)	C++17	100 / 100	27 ms	7680 KiB

friends

                              ///~~~LOTA~~~///
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define append push_back
#define add insert
#define nl "\n"
#define ff first
#define ss second
#define pii pair<int,int>
#define all(x) (x).begin(),(x).end()
#define L0TA ios_base::sync_with_stdio(false);cin.tie(NULL)
#define N 100001
void solve(){
    int n,m,o,p,q,r;
    string s,t;
    cin>>n>>s;
    s.append('.');
    if(n%2==0){
        cout<<"NOT POSSIBLE";
        return;
    }
    m=n/2;
    t="";
    for(int i=0;i<m;i++){
        if(s[i]!=s[i+m+1])
            break;
        t.append(s[i]);
    }
    if(t.size()==m){
        cout<<t;
        return;
    }
    o=p=q=0;
    for(int i=m;i<n;i++)
        if(s[i]==s[o]) o++;
    if(o>=m) p=1;
    o=m+1;
    for(int i=0;i<=m;i++)
        if(s[i]==s[o]) o++;
    if(o>=n) q=1;
    if(p && q) cout<<"NOT UNIQUE";
    else if(p){
        for(int i=0;i<m;i++)
            cout<<s[i];
    }
    else if(q){
        for(int i=m+1;i<n;i++)
            cout<<s[i];
    }
    else cout<<"NOT POSSIBLE";
}
int main(){
    L0TA;
    solve();
    return 0;
}

Compilation message (stderr)

friends.cpp: In function 'void solve()':
friends.cpp:30:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |     if(t.size()==m){
      |        ~~~~~~~~^~~
friends.cpp:15:19: warning: unused variable 'r' [-Wunused-variable]
   15 |     int n,m,o,p,q,r;
      |                   ^

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