Submission #753426

#	Time	Username	Problem	Language	Result	Execution time	Memory
753426		Jomnoi	Cyberland (APIO23_cyberland)	C++17	97 / 100	1242 ms	64640 KiB

cyberland

#include <bits/stdc++.h>
#include "cyberland.h"
using namespace std;

const int MAX_N = 1e5 + 5;
const int MAX_K = 71;
const long long INF = 1e18 + 7;

vector <pair <int, int>> graph[MAX_N];
double dist[MAX_N][MAX_K];
bool visited[MAX_N];

double solve(int N, int M, int K, int H, vector <int> x, vector <int> y, vector <int> c, vector <int> arr) {
    K = min(K, 65);

    for (int i = 0; i < N; i++) {
        graph[i].clear();
        visited[i] = false;
        for (int k = 0; k <= K; k++) {
            dist[i][k] = INF;
        }
    }

    for (int i = 0; i < M; i++) {
        graph[x[i]].emplace_back(y[i], c[i]);
        graph[y[i]].emplace_back(x[i], c[i]);
    }

    queue <int> q;
    q.push(0);
    visited[0] = true;
    while (!q.empty()) {
        int u = q.front();
        q.pop();

        for (auto [v, c] : graph[u]) {
            if (visited[v] == true or v == H) continue;

            visited[v] = true;
            q.push(v);
        }
    }

    priority_queue <tuple <double, int, int>> pq;
    arr[0] = 0;
    for (int i = 0; i < N; i++) {
        if (visited[i] == false or arr[i] != 0) continue;

        pq.emplace(0, 0, i);
        dist[i][0] = 0;
    }

    while (!pq.empty()) {
        auto [d, k, u] = pq.top();
        pq.pop();

        if (dist[u][k] < d or u == H) continue;

        for (auto [v, c] : graph[u]) {
            if (dist[u][k] + c < dist[v][k]) {
                dist[v][k] = dist[u][k] + c;
                pq.emplace(-dist[v][k], k, v);
            }
            if (arr[v] == 2 and k < K and (dist[u][k] + c) / 2.0 < dist[v][k + 1]) {
                dist[v][k + 1] = (dist[u][k] + c) / 2.0;
                pq.emplace(-dist[v][k + 1], k + 1, v);
            }
        }
    }

    double res = INF;
    for (int k = 0; k <= K; k++) res = min(res, dist[H][k]);

    if (res == INF) res = -1;
    return res;
}

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 7 / 7
• Subtask 6: 16 / 16
• Subtask 7: 29 / 29
• Subtask 8: 0 / 3