Submission #672358

#	Time	Username	Problem	Language	Result	Execution time	Memory
672358		Hacv16	Crocodile's Underground City (IOI11_crocodile)	C++17	100 / 100	535 ms	133916 KiB

crocodile

#include<bits/stdc++.h>
//#include "crocodile.h"
using namespace std;
 
typedef long long ll;
 
const int MAX = 2e6 + 15;
const int INF = 0x3f3f3f3f;
 
#define fr first
#define sc second
 
ll dist[MAX][2], ans;
bool seen[MAX];
vector<pair<ll, ll>> adj[MAX];
 
int travel_plan(int n, int m, int R[][2], int L[], int k, int P[]){
	for(int i = 0; i < m; i++){
		ll u = R[i][0], v = R[i][1], w = L[i];
 
		adj[u].push_back({v, w});
		adj[v].push_back({u, w});
	}
 
	for(int i = 0; i < n; i++)
		dist[i][0] = dist[i][1] = INF;
 
	priority_queue<pair<ll, ll>, vector<pair<ll, ll>>, greater<pair<ll, ll>>> q;
 
	for(int i = 0; i < k; i++){
		dist[P[i]][0] = dist[P[i]][1] = 0;
		q.push({0, P[i]});
	}
 
	while(q.size()){
		ll u = q.top().sc; q.pop();
 
		if(seen[u]) continue;
 
		seen[u] = true;
 
		for(auto e : adj[u]){
			ll v = e.fr, w = e.sc;
 
			if(dist[u][1] + w < dist[v][0]){
				dist[v][1] = dist[v][0];
				dist[v][0] = dist[u][1] + w;
				q.push({dist[v][1], v});
 
			}else if(dist[u][1] + w < dist[v][1]){
				dist[v][1] = dist[u][1] + w;
				q.push({dist[v][1], v});
			}
		}
	}
 
	return dist[0][1];
}

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