Submission #753464

#	Time	Username	Problem	Language	Result	Execution time	Memory
753464		Jomnoi	Cyberland (APIO23_cyberland)	C++17	100 / 100	175 ms	64596 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 power[MAX_K], 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, 66);

    power[0] = 1.0;
    for (int i = 1; i <= K; i++) power[i] = power[i - 1] / 2.0;
 
    arr[0] = 0;
    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;
    pq.emplace(0, 0, H);
    dist[H][0] = 0;

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

        if (dist[u][k] < -d) continue;
        if (arr[u] == 0) return -d;
 
        for (auto [v, c] : graph[u]) {
            if (visited[v] == false) continue;

            if (dist[u][k] + power[k] * c < dist[v][k]) {
                dist[v][k] = dist[u][k] + power[k] * c;
                pq.emplace(-dist[v][k], k, v);
            }
            if (arr[v] == 2 and k < K and dist[u][k] + power[k] * c < dist[v][k + 1]) {
                dist[v][k + 1] = dist[u][k] + power[k] * c;
                pq.emplace(-dist[v][k + 1], k + 1, v);
            }
        }
    }
    return -1;
}

• 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: 3 / 3