Submission #869776

#	Time	Username	Problem	Language	Result	Execution time	Memory
869776		DylanSmith	Fireworks (APIO16_fireworks)	C++17	0 / 100	1 ms	348 KiB

fireworks

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define pb push_back
#define sz(x) (int)x.size()
#define all(x) begin(x),end(x)
#define lb(x,y) lower_bound(all(x),y)-begin(x)

mt19937 rng;

void solve() {
    int N, M; cin >> N >> M;
    vector<vector<int>> adj(N);
    vector<int> len(N + M, 0);
    for (int i = 1; i < N + M; i++) {
        int u; cin >> u; u--;
        adj[u].pb(i);
        cin >> len[i];
    }
    vector<vector<int>> x(N + M);
    vector<int> y(N + M);
    for (int u = N + M - 1; u >= 0; u--) {
        if (u >= N) {
            x[u].pb(0);
            x[u].pb(0);
            y[u] = 0;
        } else {
            vector<int> srt;
            for (int v : adj[u]) {
                for (int n : x[v]) srt.pb(n);
            }
            sort(all(srt));
            x[u].pb(srt[sz(srt) / 2 - 1]);
            x[u].pb(srt[sz(srt) / 2]);
            y[u] = 0;
            for (int v : adj[u]) {
                if (x[u][0] <= x[v][0]) {
                    y[u] += x[v][0] - x[u][0] + y[v];
                } else if (x[u][0] <= x[v][1]) {
                    y[u] += y[v];
                } else {
                    y[u] += x[u][0] - x[v][1] + y[v];
                }
            }
        }
        x[u][0] += len[u];
        x[u][1] += len[u];
    }
    cout << y[0] << "\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    rng = mt19937(chrono::steady_clock::now().time_since_epoch().count());

    solve();

    return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 19
• Subtask 3: 0 / 29
• Subtask 4: 0 / 45