Submission #574208

#	Time	Username	Problem	Language	Result	Execution time	Memory
574208		moday_morning	The Xana coup (BOI21_xanadu)	C++17	0 / 100	67 ms	3876 KiB

xanadu

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

signed main() {
    int n;
    cin >> n;
    vector <pair <int, int> > v(n);
    for (int i = 0; i < n - 1; i++) {
        cin >> v[i].first >> v[i].second;
    }
    int cnt0 = 0, cnt1 = 0;
    vector <int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        if (a[i] == 0) {
            cnt0++;
        }
        else {
            cnt1++;
        }
    }
    if (n % 2 == 1) {
        if (cnt1 == 1) {
            cout << "impossible\n";
        }
        else if (cnt1 % 2 == 1) {
            cout << n - 1 << "\n";
        }
        else {
            cout << "impossible\n";
        }
    }
    else {
        if (cnt0 % 2 == 0) {
            cout << n - 1 << "\n";
        }
        else {
            cout << "impossible\n";
        }
    }
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 10
• Subtask 4: 0 / 40
• Subtask 5: 0 / 30