oj.uz

Submission #571771

# Submission time Handle Problem Language Result Execution time Memory
571771 2022-06-02T16:56:12 Z piOOE Chase (CEOI17_chase) C++17
70 / 100
 92 ms 12552 KB 
#include <bits/stdc++.h>

using namespace std;

#define sz(x) ((int)size(x))
#define all(x) begin(x), end(x)
#define trace(x) cout << #x << ": " << (x) << endl;

typedef long long ll;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int rand(int l, int r) { return (int) ((ll) rnd() % (r - l + 1)) + l; }

const int N = 100001;
const ll infL = 3e18;

vector<int> g[N];
int n, k;
ll p[N], ans = 0;

multiset<ll> st;

ll sum_set = 0;

void dfs(int v, int par) {
    ll sum = 0;
    for (int to : g[v]) {
        if (to != par) {
            sum += p[to];
        }
    }
    bool add = false;
    ll del = -1;
    if (sz(st) < k) {
        st.insert(sum);
        sum_set += sum;
        add = true;
    } else {
        assert(!st.empty());
        if (*st.begin() < sum) {
            del = *st.begin();
            sum_set -= del;
            st.erase(st.begin());
            add = true;
            sum_set += sum;
            st.insert(sum);
        }
    }
    ans = max(ans, sum_set);
    for (int to: g[v]) {
        if (to != par) {
            dfs(to, v);
        }
    }
    if (add) {
        sum_set -= sum;
        st.extract(sum);
    }
    if (del != -1) {
        sum_set += del;
        st.insert(del);
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> k;
    for (int i = 0; i < n; ++i) {
        cin >> p[i];
    }
    for (int i = 1; i < n; ++i) {
        int a, b;
        cin >> a >> b;
        --a, --b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    if (k == 0) {
        cout << 0;
        return 0;
    }
    if (n <= 1000) {
        for (int s = 0; s < n; ++s) {
            dfs(s, -1);
        }
        cout << ans;
    } else {
        dfs(0, -1);
        cout << ans;
    }
    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 92 ms 2740 KB Output is correct
8 Correct 20 ms 2644 KB Output is correct
9 Correct 43 ms 2644 KB Output is correct
10 Correct 82 ms 2708 KB Output is correct
11 Correct 80 ms 2700 KB Output is correct
12 Correct 51 ms 2644 KB Output is correct

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 45 ms 10536 KB Output is correct
2 Correct 42 ms 12552 KB Output is correct
3 Correct 34 ms 9052 KB Output is correct
4 Correct 42 ms 8700 KB Output is correct
5 Correct 53 ms 8780 KB Output is correct
6 Correct 53 ms 8780 KB Output is correct
7 Correct 55 ms 8784 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 92 ms 2740 KB Output is correct
8 Correct 20 ms 2644 KB Output is correct
9 Correct 43 ms 2644 KB Output is correct
10 Correct 82 ms 2708 KB Output is correct
11 Correct 80 ms 2700 KB Output is correct
12 Correct 51 ms 2644 KB Output is correct
13 Correct 45 ms 10536 KB Output is correct
14 Correct 42 ms 12552 KB Output is correct
15 Correct 34 ms 9052 KB Output is correct
16 Correct 42 ms 8700 KB Output is correct
17 Correct 53 ms 8780 KB Output is correct
18 Correct 53 ms 8780 KB Output is correct
19 Correct 55 ms 8784 KB Output is correct
20 Incorrect 49 ms 8672 KB Output isn't correct
21 Halted 0 ms 0 KB -