oj.uz

답안 #571769

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
571769 2022-06-02T16:54:52 Z piOOE Chase (CEOI17_chase) C++17
0 / 100
 40 ms 10480 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 (n <= 1000) {
        for (int s = 0; s < n; ++s) {
            dfs(s, -1);
        }
        cout << ans;
    } else {
        dfs(0, -1);
    }
    return 0;
}

Subtask #1
0 / 20.0

# 결과 실행 시간 메모리 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 2 ms 2644 KB Output is correct
5 Runtime error 4 ms 5204 KB Execution killed with signal 6
6 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 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 2 ms 2644 KB Output is correct
5 Runtime error 4 ms 5204 KB Execution killed with signal 6
6 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 40 ms 10480 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 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 2 ms 2644 KB Output is correct
5 Runtime error 4 ms 5204 KB Execution killed with signal 6
6 Halted 0 ms 0 KB -