Submission #1293885

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293885		nnargiz	Paprike (COI18_paprike)	C++20	100 / 100	50 ms	30940 KiB

paprike

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define int long long
using namespace __gnu_pbds;
using namespace std;
const int mod = 1e9+7;
const int inf = 1e18;
const int maxx = 2e6 + 5;
typedef tree <int, null_type, less_equal <int>, rb_tree_tag, tree_order_statistics_node_update> ordered_multiset;

vector <int> g[maxx], a(maxx);
int n, k, ans = 0;

int dfs(int v, int p) {
    vector <int> j;
    for (int u : g[v]) {
        if (u == p) {
            continue;
        }
        int x = dfs(u, v);
        j.push_back(x);
    }
    sort (j.begin(), j.end());
    int sum = a[v];
    for (int x : j) {
        if (sum + x <= k) {
            sum += x;
        }
        else {
            ans++;
        }
    }
    return sum;
}

void solve() {
    cin >> n >> k;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    dfs(1, 0);
    cout << ans << endl;
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t = 1;
    //cin >> t;
    while (t--) {
        solve();
    }
}

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