Submission #958818

#	Time	Username	Problem	Language	Result	Execution time	Memory
958818		dpsaveslives	Crocodile's Underground City (IOI11_crocodile)	C++17	100 / 100	401 ms	51272 KiB

crocodile

#include <bits/stdc++.h>
#define f first
#define s second
using namespace std;
const int MAXN = 1e5+10;
vector<pair<int,int>> adj[MAXN];
int travel_plan(int N,int M,int (*R)[2],int *L,int K,int *P){
    for(int i = 0;i<M;++i){
        int u = R[i][0], v = R[i][1], w = L[i];
        adj[u].push_back({v,w}); adj[v].push_back({u,w});
    }
    priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> pq;
    vector<vector<int>> dist(N);
    for(int i = 0;i<K;++i){
        pq.push({0,P[i]});
        dist[P[i]].push_back(0); dist[P[i]].push_back(0);
    }
    vector<bool> vis(N,false); 
    while(!pq.empty()){
        int cd = pq.top().f, u = pq.top().s; pq.pop();
      	if(cd != dist[u][1]) continue; 
      	if(vis[u]) continue; 
        vis[u] = true; 
        for(auto p : adj[u]){
            int v = p.f, w = p.s;
            if(dist[v].size() == 0){
                dist[v].push_back(dist[u][1]+w);
            }
            else if(dist[v].size() == 1){
                dist[v].push_back(dist[u][1]+w);
                if(dist[v][0] > dist[v][1]) swap(dist[v][0],dist[v][1]); 
                pq.push({dist[v][1],v});
            }
            else{
                if(dist[u][1]+w < dist[v][0]){
                    dist[v][1] = dist[v][0];
                    dist[v][0] = dist[u][1]+w;
                    pq.push({dist[v][1],v});
                }
                else if(dist[u][1]+w < dist[v][1]){
                    dist[v][1] = dist[u][1]+w;
                    pq.push({dist[v][1],v});
                }
            }
        }
    }
    return dist[0][1];
}

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