Submission #1015496

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015496		aufan	Cyberland (APIO23_cyberland)	C++17	100 / 100	1350 ms	71848 KiB

cyberland

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

using namespace std;
const double INFF = 1e18;
double solve(int n, int m, int k, int h, vector<int> x, vector<int> y, vector<int> c, vector<int> arr) {
    vector<vector<pair<int, double>>> v(n);
    for (int i = 0; i < m; i++) {
        v[x[i]].push_back({y[i], c[i]});
        v[y[i]].push_back({x[i], c[i]});
    }
    k = min(k, 70);
    vector<vector<double>> dist(n, vector<double>(k + 1, INFF));
    priority_queue<tuple<double, int, int>, vector<tuple<double, int, int>>, greater<tuple<double, int, int>>> pq;
    dist[0][0] = 0;
    pq.push({0, 0, 0});
    for (int _ = 0; _ <= k; _++) {  
        priority_queue<tuple<double, int, int>, vector<tuple<double, int, int>>, greater<tuple<double, int, int>>> tmp;
        while (!pq.empty()) {
            auto [d, x, ck] = pq.top();
            pq.pop();
            if (dist[x][ck] < d || x == h) continue;
            for (auto [z, c] : v[x]) {
                if (arr[z] == 0 && 0 < dist[z][ck]) {
                    dist[z][ck] = 0;
                    pq.push({dist[z][ck], z, ck});
                }
                if (arr[z] == 1 && d + c < dist[z][ck]) {
                    dist[z][ck] = d + c;
                    pq.push({dist[z][ck], z, ck});
                } 
                if (arr[z] == 2 && d + c < dist[z][ck]) {
                    dist[z][ck] = d + c;
                    pq.push({dist[z][ck], z, ck});
                }
                if (ck < k && arr[z] == 2 && (d + c) / (double) (2) < dist[z][ck + 1]) {
                    dist[z][ck + 1] = (d + c) / (double) (2);
                    tmp.push({dist[z][ck + 1], z, ck + 1});
                }
            }
        }

        swap(pq, tmp);
    }
    double ans = INFF;
    for (int ck = 0; ck <= k; ck++) ans = min(ans, dist[h][ck]);
    // loh bisa -1
    return (ans == INFF ? -1 : ans);
}

• 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