Submission #615373

#	Time	Username	Problem	Language	Result	Execution time	Memory
615373		Hanksburger	Three Friends (BOI14_friends)	C++17	100 / 100	13 ms	10100 KiB

friends

#include <bits/stdc++.h>
using namespace std;
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, cnt=0;
    string s, a, b;
    cin >> n >> s;
    if (n%2==0)
    {
        cout << "NOT POSSIBLE";
        return 0;
    }
    if (s.substr(0, n/2)==s.substr(n/2, n/2) && s.substr(1, n/2)==s.substr(n/2+1, n/2) && s.substr(0, n/2)!=s.substr(1, n/2))
    {
        cout << "NOT UNIQUE";
        return 0;
    }
    a=s.substr(1, n/2);
    b=s.substr(n/2+1, n/2);
    for (int i=0; i<n/2; i++)
        if (a[i]!=b[i])
            cnt++;
    if (!cnt)
    {
        cout << a;
        return 0;
    }
    for (int i=0; i<n/2; i++)
    {
        if (a[i]!=b[i])
            cnt--;
        a[i]=s[i];
        if (a[i]!=b[i])
            cnt++;
        if (!cnt)
        {
            cout << a;
            return 0;
        }
    }
    for (int i=0; i<n/2; i++)
    {
        if (a[i]!=b[i])
            cnt--;
        b[i]=s[n/2+i];
        if (a[i]!=b[i])
            cnt++;
        if (!cnt)
        {
            cout << a;
            return 0;
        }
    }
    cout << "NOT POSSIBLE";
    return 0;
}

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