Submission #1252652

#	Time	Username	Problem	Language	Result	Execution time	Memory
1252652		anfi	Cyberland (APIO23_cyberland)	C++20	15 / 100	1391 ms	1998432 KiB

cyberland

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
const double INF = 1e30;

double solve(int N, int M, int K, int H, vector<int> x, vector<int> y, vector<int> c, vector<int> arr){
    vector<pair<int,int>> adj[N];
    for(int i = 0; i < M; i++){
        adj[x[i]].emplace_back(y[i], c[i]);
        adj[y[i]].emplace_back(x[i], c[i]);
    }

    vector<vector<double>> dist(N, vector<double>(K+1, INF));
    priority_queue<tuple<double,int,int>, vector<tuple<double,int,int>>, greater<>> pq;

    dist[0][0] = 0.0;
    pq.emplace(0.0, 0, 0);

    while(!pq.empty()){
        auto [cost, u, kused] = pq.top(); pq.pop();
        if(cost > dist[u][kused] + 1e-9) continue;

        for(auto &[v, w] : adj[u]){
            double ncost = cost + w;

            // 1. Normal move
            if(dist[v][kused] > ncost + 1e-9){
                dist[v][kused] = ncost;
                pq.emplace(ncost, v, kused);
            }

            // 2. Jika negara v adalah tipe RESET (arr[v] == 0), kita bisa reset waktu ke 0 setelah sampai di v
            if(arr[v] == 0 && dist[v][kused] > 0.0 + 1e-9){
                dist[v][kused] = 0.0;
                pq.emplace(0.0, v, kused);
            }

            // 3. Jika negara v adalah bagi-dua (arr[v]==2) dan kita belum pakai K kali
            if(arr[v] == 2 && kused < K){
                double hcost = ncost / 2.0;
                if(dist[v][kused+1] > hcost + 1e-9){
                    dist[v][kused+1] = hcost;
                    pq.emplace(hcost, v, kused+1);
                }
            }
        }
    }

    double ans = INF;
    for(int i = 0; i <= K; i++) ans = min(ans, dist[H][i]);
    return (ans >= INF/2 ? -1.0 : ans);
}

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