Submission #927397

#	Time	Username	Problem	Language	Result	Execution time	Memory
927397		aykhn	Closing Time (IOI23_closing)	C++17	8 / 100	139 ms	40632 KiB

closing

#include <bits/stdc++.h>
#include "closing.h"

using namespace std;

const int MXN = 2e5 + 5;

int n, x, y;
long long k;
vector<array<long long, 2>> adj[MXN];
long long d[2][MXN];

void dfs(int a, int p, int t)
{
    for (const array<long long, 2> &v : adj[a])
    {
        if (v[0] == p) continue;
        d[t][v[0]] = d[t][a] + v[1];
        dfs(v[0], a, t);
    }
}

int max_score(int N, int X, int Y, long long K, vector<int> U, vector<int> V, vector<int> W)
{
    n = N, x = X, y = Y, k = K;
    for (int i = 0; i < n; i++)
    {
        d[0][i] = d[1][i] = 0;
        adj[i].clear();
    }
    for (int i = 0; i < n - 1; i++)
    {
        adj[U[i]].push_back({V[i], W[i]});
        adj[V[i]].push_back({U[i], W[i]});
    }
    dfs(x, x, 0);
    dfs(y, y, 1);
    vector<long long> v;
    for (int i = 0; i < n; i++) v.push_back(min(d[1][i], d[0][i]));
    sort(v.begin(), v.end());
    int res = 0;
    for (int i = 0; i < n; i++)
    {
        k -= v[i];
        if (k < 0) break;
        res++;
    }
    return res;
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 9
• Subtask 6: 0 / 11
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 17