Submission #426109

#	Time	Username	Problem	Language	Result	Execution time	Memory
426109		someone	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	930 ms	77984 KiB

crocodile

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

struct Node {
    ll i, t;

    bool operator <(const Node& other) const {
        return t > other.t;
    }
};

const ll N = 1e5 + 10, INF = 1e18;

priority_queue<Node> q;
vector<ll> adj[N], len[N];
ll n, m, dist[N][2];

void Dijkstra() {
    while(!q.empty()) {
        Node node = q.top();
        q.pop();
        int i = node.i, t = adj[i].size();
        if(dist[i][1] == node.t) {
            for(int j = 0; j < t; j++) {
                ll nex = adj[i][j],
                   time = dist[i][1] + len[i][j];
                   
                if(time < dist[nex][0])
                    swap(time, dist[nex][0]);
                if(time < dist[nex][1]) {
                    swap(time, dist[nex][1]);
                    q.push({nex, dist[nex][1]});
                }
            }
        }
    }
}

int travel_plan(int n1, int m1, int R[][2], int L[], int K, int P[]) {
    n = n1, m = m1;
    for(int i = 0; i < m; i++) {
        len[R[i][0]].push_back(L[i]);
        len[R[i][1]].push_back(L[i]);
        adj[R[i][0]].push_back(R[i][1]);
        adj[R[i][1]].push_back(R[i][0]);
    }
    for(int i = 0; i < n; i++)
        dist[i][0] = dist[i][1] = INF;
    for(int i = 0; i < K; i++)
        dist[P[i]][0] = dist[P[i]][1] = 0;
    for(int i = 0; i < K; i++)
        q.push({P[i], 0});
    Dijkstra();
    return dist[0][1];
}

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