Submission #920301

#	Time	Username	Problem	Language	Result	Execution time	Memory
920301		NotLinux	Cyberland (APIO23_cyberland)	C++17	100 / 100	852 ms	10828 KiB

cyberland

#include "cyberland.h"
#include<bits/stdc++.h>
using namespace std;
const double INF = 1e18;
struct Data{
    int u;
    double w;
    Data(int _u, double _w) : u(_u), w(_w) {}
    friend bool operator <(Data a, Data b){
        return a.w > b.w;
    }
};
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, int>>>e(n);
    for(int i = 0; i < m; i++){
        e[x[i]].emplace_back(y[i], c[i]);
        e[y[i]].emplace_back(x[i], c[i]);
    }
    priority_queue<Data>q;
    vector<double>d(n, INF);
    q.emplace(0, d[0] = 0.0);
    double ans = INF;
    for(int i = min(k, 80); i > -1; i--){
        vector<double>D(n, INF);
        priority_queue<Data>Q;
        while(!q.empty()){
            auto [u, w] = q.top();
            q.pop();
            if(w > d[u] || u == h){
                continue;
            }
            for(auto& [v, weight] : e[u]){
                if(arr[v] == 0){
                    if(d[v] > 0.0){
                        q.emplace(v, d[v] = 0.0);
                    }
                }
                else{
                    double W = w + double(weight);
                    if(W < d[v]){
                        q.emplace(v, d[v] = W);
                    }
                    if(arr[v] == 2 && i > 0 && (W /= 2.0) < D[v]){
                        Q.emplace(v, D[v] = W);
                    }
                }
            }
        }
        if(ans > d[h])ans = d[h];
        d = D;
        q = Q;
    }
    return ans == INF ? -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