Cod sursa(job #700318)

Utilizator alexdmotocMotoc Alexandru alexdmotoc Data 1 martie 2012 09:26:46
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 2.06 kb
//O(MlogN)
#include <cstdio>
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;


#define PB push_back
#define MKP make_pair
#define INF 0x3f3f3f3f
#define maxN 50005


int N , M , cost[maxN];
bool viz[maxN];

int H[maxN] , pozH[maxN] , dim;


vector <pair <int , int> > lista[maxN];


void push (int nod)
{
	int tata = nod / 2;
	
	if (nod == 1) return;
	if (cost[H[tata]] <= cost[H[nod]]) return;
	
	swap (H[tata] , H[nod]);
	swap (pozH[H[tata]] , pozH[H[nod]]);
	
	push (pozH[H[tata]]);
}


void pop (int nod)
{
	int f1 = nod * 2;
	int f2 = nod * 2 + 1;
	int nodmin = nod;
	
	
	if (f1 <= dim && cost[H[f1]] < cost[H[nodmin]])
		nodmin = f1;
	
	if (f2 <= dim && cost[H[f2]] < cost[H[nodmin]])
		nodmin = f2;
	
	
	if (nodmin == nod) return;
	
	
	swap (H[nod] , H[nodmin]);
	swap (pozH[H[nodmin]] , pozH[H[nod]]);
	
	pop (pozH[H[nodmin]]);
}


void make_heap ()
{
	for (int i = 1 ; i <= N ; ++i)
	{
		H[++dim] = i;
		pozH[i] = dim;
		
		push (dim);
	}
}


int get_min ()
{
	int nod = H[1];
	
	swap (H[1] , H[dim]);
	swap (pozH[H[1]] , pozH[H[dim]]);
	
	--dim;
	pop (pozH[H[1]]);
	
	return nod;
}


int main ()
{
	freopen ("dijkstra.in" , "r" , stdin);
	freopen ("dijkstra.out" , "w" , stdout);
	
	scanf ("%d %d" , &N , &M);
	
	
	int a , b , c;
	
	for (int i = 1 ; i <= N ; ++i)
	{
		scanf ("%d %d %d" , &a , &b , &c);
		
		lista[a].PB (MKP (b , c));
	}
	
	
	for (int i = 2 ; i <= N ; ++i)
		cost[i] = INF;
	
	
	make_heap ();
	
	
	while (dim)
	{
		int nod = get_min ();
		
		viz[nod] = true;
		
		for (unsigned int i = 0 ; i < lista[nod].size () ; ++i)
		{
			int nodcur = lista[nod][i].first;
			int costcur = lista[nod][i].second;
			
			if (viz[nodcur]) continue;
			if (cost[nodcur] <= cost[nod] + costcur) continue;
			
			cost[nodcur] = cost[nod] + costcur;
			
			
			push (pozH[nodcur]);
		}
	}
	
	
	for (int i = 2 ; i <= N ; ++i)
		if (cost[i] == INF) 
			printf ("0 ");
		
		else printf ("%d " , cost[i]);
	
	
	return 0;
}