Submission #397086

#	Time	Username	Problem	Language	Result	Execution time	Memory
397086		Alma	Three Friends (BOI14_friends)	C++17	0 / 100	13 ms	7208 KiB

friends

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

    int n; cin >> n;
    string s; cin >> s;

    if (n % 2 == 0) {
        cout << "NOT POSSIBLE\n";
        return 0;
    }

    bool left = true, l = true;
    string leftPart = s.substr(0, n/2);
    int a = 0, b = n/2;
    while (a < n/2 && b < n) {
        if (leftPart[a] != s[b]) {
            if (l) {
                b++;
                l = false;
            } else {
                left = false;
                break;
            }
        }
        a++; b++;
    }

    bool right = true, r = true;
    string rightPart = s.substr(n/2+1, n/2);
    int c = 0, d = 0;
    while (c < n/2 && d <= n/2) {
        if (rightPart[c] != s[d]) {
            if (r) {
                d++;
                r = false;
            } else {
                right = false;
                break;
            }
        }
        c++; d++;
    }
  
    if (left && right) {
        if (leftPart == rightPart) cout << leftPart << '\n';
        else cout << "NOT UNIQUE\n";
    } else if (left) {
        cout << leftPart << '\n';
    } else if (right) {
        cout << rightPart << '\n';
    } else {
        cout << "NOT POSSIBLE\n";
    }

    return 0;
}

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