Submission #1253922

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253922		anfi	Cyberland (APIO23_cyberland)	C++20	0 / 100	17 ms	7232 KiB

cyberland

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

const double INF = 1e8;

double solve(int n, int m, int k, int h, vector<int> x, vector<int> y, vector<int> c, vector<int> a) {
    k = min(k, 100);
    vector<vector<pair<int, double>>> adj(n);
    
    for(int i = 0; i < m; i++) {
        adj[x[i]].push_back({y[i], c[i]});
        adj[y[i]].push_back({x[i], c[i]});
    }

    vector<double> dist(n, INF), temp(n, INF);
    priority_queue<pair<double, int>> pq;

    for(auto &p : temp) p = INF;
    for(auto i = 0; i < k; i++) {
        pq.push({0, i});
        temp[i] = 0.;
    }

    while(!pq.empty()) {
        auto [cur, u] = pq.top(); pq.pop();
        if(cur != -dist[u]) continue;
        
        for(auto [v, w] : adj[u]) {
            if(temp[v] > cur + w) {
                temp[v] = cur + w;
                pq.push({-temp[v], v});
            }
        }
    }

    double ans = INF;
    for(auto &p : temp) p = INF;
    for(auto i = 0; i < k; i++) {
        pq.push({0, i});
        temp[i] = 0.;
    }

    while(!pq.empty()) {
        auto [cur, u] = pq.top(); pq.pop();
        if(cur != -dist[u]) continue;
        
        for(auto [v, w] : adj[u]) {
            if(temp[v] > cur + w) {
                temp[v] = cur + w;
                pq.push({-temp[v], v});
            }
        }
    }

    ans = min(ans, temp[h]);
    return ans < INF ? ans : -1.;
}

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