Submission #502198

#	Time	Username	Problem	Language	Result	Execution time	Memory
502198		HappyPacMan	Crocodile's Underground City (IOI11_crocodile)	C++14	100 / 100	661 ms	51776 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
using namespace std;
 
int travel_plan(int N, int M, int R[][2], int L[], int K, int P[]){
    vector<pair<int,int> > adj[N];
    for(int i=0;i<M;i++){
        adj[R[i][0]].emplace_back(R[i][1],L[i]);
        adj[R[i][1]].emplace_back(R[i][0],L[i]);
    }
    priority_queue<long long> cnt[N];
    bool vis[N];
    long long dist[N];
    memset(vis,0,sizeof(vis));
    memset(dist,127,sizeof(dist));
    priority_queue<pair<long long,int>,vector<pair<long long,int> >,greater<pair<int,int> > > pq;
    for(int i=0;i<K;i++){
        dist[P[i]] = 0;
        pq.emplace(dist[P[i]],P[i]);
    }
    while(!pq.empty()){
        auto curr = pq.top();
        pq.pop();
        if(vis[curr.second]) continue;
        vis[curr.second] = true;
        for(auto it : adj[curr.second]){
            cnt[it.first].emplace(curr.first+it.second);
            while(cnt[it.first].size() > 2)cnt[it.first].pop();
            if(cnt[it.first].size() > 1 && dist[it.first] > cnt[it.first].top()){
                dist[it.first] = cnt[it.first].top();
                pq.emplace(dist[it.first],it.first);
            }
        }
    }
    return dist[0];
}

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