Submission #943967

#	Time	Username	Problem	Language	Result	Execution time	Memory
943967		Amaarsaa	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	397 ms	91844 KiB

crocodile

#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;

#define ll long long
#define INF 1e18

ll travel_plan(int N, int M, int R[][2], int L[], int K, int P[]){
    int n = N, m = M, k = K;
    vector<vector<pair<int, ll>>> graph(n);
    for (int i = 0; i < m; i++){
        graph[R[i][0]].push_back({R[i][1], L[i]});
        graph[R[i][1]].push_back({R[i][0], L[i]});
    }
    ll dist[n][2];
    for (int i = 0; i < n; i++){
        dist[i][0] = INF, dist[i][1] = INF;
    }
    priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq;
    for (int i = 0; i < k; i++){
        dist[P[i]][0] = 0;
        dist[P[i]][1] = 0;
        pq.push({0, P[i]});
    }
    while (!pq.empty()){
        ll cur_dis = pq.top().first;
        int u = pq.top().second;
        pq.pop();
        if (cur_dis != dist[u][1]){
            continue;
        }
        for (pair<int, int> p: graph[u]){
            int v = p.first, w = p.second;
            if (dist[v][0] > w + cur_dis){
                if (dist[v][0] != dist[v][1] && dist[v][0] < INF){
                    dist[v][1] = dist[v][0];
                    pq.push({dist[v][1], v});
                }
                dist[v][0] = w+cur_dis;
            }else if (dist[v][1] > w + cur_dis){
                dist[v][1] = w + cur_dis;
                pq.push({dist[v][1], v});
            }
        }
    }
    return dist[0][1];
}

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