Submission #585742

#	Time	Username	Problem	Language	Result	Execution time	Memory
585742		tengiz05	Chase (CEOI17_chase)	C++17	70 / 100	572 ms	16076 KiB

chase

#include <bits/stdc++.h>

using i64 = long long;
using namespace std;

void solve() {
    int n, k;
    cin >> n >> k;
    
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    
    vector<vector<int>> e(n);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        u--;
        v--;
        e[u].push_back(v);
        e[v].push_back(u);
    }
    
    multiset<i64> q;
    
    i64 ans = 0;
    
    function<void(int, int)> dfs = [&](int u, int p) {
        i64 s = 0;
        for (int v : e[u]) {
            if (v != p) {
                s += a[v];
            }
        }
        q.insert(s);
        i64 res = 0;
        auto it = q.end();
        for (int i = 0; i < min(k, int(q.size())); i++) {
            it = prev(it);
            res += *it;
        }
        ans = max(ans, res);
        for (int v : e[u]) {
            if (v != p) {
                dfs(v, u);
            }
        }
        q.erase(q.find(s));
    };
    
    if (n <= 1000) {
        for (int i = 0; i < n; i++) {
            dfs(i, -1);
        }
    } else {
        dfs(0, -1);
    }
    
    cout << ans << "\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    
    while (t--) {
        solve();
    }
    
    return 0;
}

/*

12 2
2 3 3 8 1 5 6 7 8 3 5 4
2 1
2 7
3 4
4 7
7 6
5 6
6 8
6 9
7 10
10 11
10 12


*/

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 30 / 30
• Subtask 4: 0 / 30