Submission #967507

#	Time	Username	Problem	Language	Result	Execution time	Memory
967507		lanaskarica	Paprike (COI18_paprike)	C++14	100 / 100	45 ms	19284 KiB

paprike

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

#define ll long long
#define pii pair <int, int>
#define fi first
#define se second

const int MAXN = 1e5 + 5;

int n, k, rj, arr[MAXN];

vector <int> v[MAXN];

int rek(int x, int p) {
    vector <int> r;
    for (auto e : v[x]) {
        if (e == p) continue;
        r.push_back(rek(e, x));
    }

//    cout << "ispis: " << x << endl;
    sort(r.begin(), r.end());
    int zb = arr[x], y = 0;
    for (int i = 0; i < r.size(); i++) {
//        cout << r[i] << " ";
        if (zb + r[i] > k) break;
        zb += r[i]; y = i + 1;
//        cout << ".";
    }
//    cout << endl;
//    cout << zb << " " << r.size() << " " << y << endl;
    rj += (r.size() - y);
    return zb;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int a, b;
    cin >> n >> k;

    for (int i = 1; i <= n; i++) {
        cin >> arr[i];
    }

    for (int i = 0; i < n - 1; i++) {
        cin >> a >> b;
        v[a].push_back(b);
        v[b].push_back(a);
    }

    rj = 0;
    rek(1, 1);
    cout << rj << "\n";

    return 0;
}

Compilation message (stderr)

paprike.cpp: In function 'int rek(int, int)':
paprike.cpp:25:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for (int i = 0; i < r.size(); i++) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 13 / 13
• Subtask 3: 27 / 27
• Subtask 4: 49 / 49