Submission #1253510

#	Time	Username	Problem	Language	Result	Execution time	Memory
1253510		anfi	Cyberland (APIO23_cyberland)	C++20	15 / 100	1018 ms	1748796 KiB

cyberland

#include <bits/stdc++.h>
using namespace std;
const double INF = 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,int>>> adj(N);
    adj.reserve(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));
    deque<pair<int,int>> dq;
    dist[0][0] = 0.0;
    dq.emplace_front(0, 0);

    while (!dq.empty()) {
        auto [u, used] = dq.front(); dq.pop_front();
        double d = dist[u][used];
        for (auto [v, w] : adj[u]) {
            double nd = d + w;
            int nk = used;
            if (arr[v] == 0) {
                nd = 0.0;
            }
            else if (arr[v] == 2 && used < K) {
                nd *= 0.5;
                nk++;
            }
            if (nd + 1e-12 < dist[v][nk]) {
                dist[v][nk] = nd;
                if (nd < d) dq.emplace_front(v, nk);
                else       dq.emplace_back(v, nk);
            }
        }
    }

    double ans = INF;
    for (int k = 0; k <= K; k++) {
        ans = min(ans, dist[H][k]);
    }
    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