Submission #892340

#	Time	Username	Problem	Language	Result	Execution time	Memory
892340		d4xn	Cyberland (APIO23_cyberland)	C++17	15 / 100	29 ms	16324 KiB

cyberland

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

#define ll long long

const int N = 1e5+5;

ll dis[2][N];
vector<pair<int, ll>> adj[N];

void dijkstra(int x, int idx) {
    priority_queue<pair<ll, int>> pq;
    pq.push(make_pair(-0, x));
    while (!pq.empty()) {
      ll d = -pq.top().first;
      int y = pq.top().second;
      pq.pop();

      if (dis[idx][y] != -1) continue;
      dis[idx][y] = d;

      for (auto& [z, d2] : adj[y]) {
        if (dis[idx][z] != -1) continue;
        pq.push(make_pair(-(d+d2), z));
      }
    }
}

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

    for (int i = 0; i < n; i++) {
        dis[0][i] = dis[1][i] = -1;
    }
    dijkstra(0, 0);
    dijkstra(h, 1);/*
for (int i = 0; i < n; i++) {
        cerr << dis[0][i] << " " << dis[1][i] << endl;
    }*/
    ll ans = dis[0][h];
    for (int i = 0; i < n; i++) {
      assert(arr[i] >= 0 && arr[i] < 2);
        if (arr[i] || dis[0][i] == -1 || dis[1][i] == -1) continue;
        ans = min(ans, dis[1][i]);
    }
    return 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