Submission #572546

#	Time	Username	Problem	Language	Result	Execution time	Memory
572546		piOOE	Magic Tree (CEOI19_magictree)	C++17	100 / 100	139 ms	37476 KiB

magictree

#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 = 100000;

map<int, ll> dp[N];

int p[N], d[N], w[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m, k;
    cin >> n >> m >> k;
    for (int i = 1; i < n; ++i) {
        cin >> p[i];
        --p[i];
    }
    for (int i = 0; i < m; ++i) {
        int v;
        cin >> v;
        --v;
        cin >> d[v] >> w[v];
    }
    for (int i = n - 1; i > -1; --i) {
        if (d[i] != 0) {
            ll sum = w[i];
            dp[i][d[i]] += w[i];
            while (true) {
                auto it = dp[i].upper_bound(d[i]);
                if (it == dp[i].end()) {
                    break;
                }
                if (it->second <= sum) {
                    sum -= it->second;
                    dp[i].erase(it);
                } else {
                    it->second -= sum;
                    break;
                }
            }
        }
        if (i > 0) {
            if (dp[p[i]].size() < dp[i].size())
                swap(dp[i], dp[p[i]]);
            for (auto [a, b] : dp[i]) {
                dp[p[i]][a] += b;
            }
        }
    }
    ll ans = 0;
    for (auto [a, b] : dp[0]) {
        ans += b;
    }
    cout << ans;
    return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 3 / 3
• Subtask 3: 11 / 11
• Subtask 4: 12 / 12
• Subtask 5: 16 / 16
• Subtask 6: 13 / 13
• Subtask 7: 22 / 22
• Subtask 8: 17 / 17