Submission #813476

#	Time	Username	Problem	Language	Result	Execution time	Memory
813476		annabeth9680	Crocodile's Underground City (IOI11_crocodile)	C++17	100 / 100	392 ms	53532 KiB

crocodile

#include "crocodile.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5+5;
vector<pair<int,int>> adj[MAXN];
vector<int> dist[MAXN]; int vis[MAXN];
int travel_plan(int N, int M, int R[][2], int L[], int K, int exits[]){
    for(int i = 0;i<M;++i){
        adj[R[i][0]].push_back({L[i],R[i][1]});
        adj[R[i][1]].push_back({L[i],R[i][0]});
    }
    priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> pq;
    for(int i = 0;i<K;++i){
        dist[exits[i]].push_back(0); dist[exits[i]].push_back(0);
        vis[exits[i]]++;
        pq.push({0,exits[i]});
    }
    while(!pq.empty()){
        int u = pq.top().second, cdist = pq.top().first; pq.pop();
        if(vis[u] >= 2) continue;
        vis[u]++;
        if(vis[u] != 2) continue;
        if(u == 0) return cdist;
        for(auto p : adj[u]){
            int cur = cdist+p.first, v = p.second;
            if(dist[v].size() < 2){
                dist[v].push_back(cur);
                pq.push({cur,v});
            }
            else if(dist[v].size() == 2){
                if(dist[v][0] > dist[v][1]) swap(dist[v][0],dist[v][1]); 
                if(dist[v][1] > cur){
                    dist[v].pop_back();
                    dist[v].push_back(cur);
                    pq.push({cur,v});
                }
            }
        }
    }
}

Compilation message (stderr)

crocodile.cpp: In function 'int travel_plan(int, int, int (*)[2], int*, int, int*)':
crocodile.cpp:12:80: warning: control reaches end of non-void function [-Wreturn-type]
   12 |     priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>> pq;
      |                                                                                ^~

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