Submission #1280449

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280449		hoangtien69	Crocodile's Underground City (IOI11_crocodile)	C++20	100 / 100	283 ms	46732 KiB

crocodile

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

#define pii pair<int,int>
#define X first
#define Y second

const int MAXN = 1e5 + 5;
const int oo = 1e9 + 1;

int travel_plan(int N, int M, int R[][2], int L[], int K, int P[])
{
    vector<vector<pii>> adj(N);
    
    for (int i = 0; i < M; i++) {
        int x = R[i][0];
        int y = R[i][1];
        int z = L[i];
        adj[x].push_back({z, y});
        adj[y].push_back({z, x});
    }
    
    vector<vector<int>> d(N, vector<int>(2, oo));
    priority_queue<pii, vector<pii>, greater<pii>> pq;
    for (int i = 0; i < K; i++) {
        d[P[i]][0] = 0;
        d[P[i]][1] = 0;
        pq.push({0, P[i]});
    }
    
    while (!pq.empty()) {
        int dist = pq.top().X;
        int u = pq.top().Y;
        pq.pop();
        
        if (dist > d[u][1]) continue;
        
        for (auto &edge : adj[u]) {
            int w = edge.X;
            int v = edge.Y;
            int new_dist = dist + w;
            if (d[v][0] > new_dist) {
                if (d[v][1] != d[v][0]) {
                    d[v][1] = d[v][0];
                    pq.push({d[v][1], v});
                }
                d[v][0] = new_dist;
            }
            else if (d[v][1] > new_dist) {
                d[v][1] = new_dist;
                pq.push({d[v][1], v});
            }
        }
    }
    
    return d[0][1];
}

• Subtask 1: 46 / 46
• Subtask 2: 43 / 43
• Subtask 3: 11 / 11