Submission #968419

#	Time	Username	Problem	Language	Result	Execution time	Memory
968419		saayan007	Cyberland (APIO23_cyberland)	C++17	44 / 100	35 ms	9348 KiB

cyberland

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

#include <vector>

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, double>> 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]);
    }

    double dist[N];
    for(int i = 0; i < N; ++i) dist[i] = -1;
    dist[0] = 0;

    // bfs 1
    queue<int> pq;
    bool vis[N] = {};
    vis[0] = 1;
    pq.push(0);
    while(!pq.empty()) {
        int a = pq.front();
        pq.pop();
        if(a == H) continue;
        if(arr[a] == 0) {
            dist[a] = 0;
        }
        for(auto [b, w] : adj[a]) {
            if(vis[b]) continue;
            vis[b] = 1;
            pq.push(b);
        }
    }
    // bfs 1 ends

    queue<int> q;
    for(int i = 0; i < N; ++i) if(dist[i] == 0) q.push(i);
    while(!q.empty()) {
        int a = q.front();
        q.pop();
        for(auto [b, w] : adj[a]) {
            if(dist[b] == -1 || dist[b] > dist[a] + w) {
                dist[b] = dist[a] + w;
                q.push(b);
            }
        }
    }
    return dist[H];
 

    /* vector<pair<int, double>> 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]); */
    /* } */

    /* double dist[N]; */
    /* for(int i = 0; i < N; ++i) dist[i] = -1; */
    // there's a pq declared earlier as well
    /* priority_queue<pair<double, int>> pq; */

    /* for(int i = 1; i < N; ++i) { */
    /*     if(arr[i] == 0 || i == 0) { */
    /*         dist[i] = 0; */
    /*         pq.emplace(-dist[i], i); */
    /*     } */
    /* } */

    /* while(!pq.empty()) { */
    /*     int a = pq.top().second; */
    /*     double d = -pq.top().first; */
    /*     pq.pop(); */
    /*     if(dist[a] < d || a == H) { */
    /*         continue; */
    /*     } */

    /*     for(auto [b, w] : adj[a]) { */
    /*         if(dist[b] == -1 || d + w < dist[b]) { */
    /*             dist[b] = d + w; */
    /*             pq.emplace(-dist[b], b); */
    /*         } */
    /*     } */
    /* } */

    /* return dist[H]; */
}

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