Cod sursa(job #713134)

Utilizator swim406Teudan Adina swim406 Data 14 martie 2012 11:52:27
Problema Algoritmul lui Dijkstra Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 0.85 kb
#include<fstream>
#include<limits>
using namespace std;
#define inf 250000000
long long n,d[50001],m;
struct graf {
	int x,y,z;
}; 
graf arc[250001];
int dist(int a, int b) {
	int k=-1;
	for(int i=1;i<=m;i++)
		if(arc[i].x==a && arc[i].y==b) {
			k=arc[i].z;
			i=m+1;
		}
	return k;
}
void bellman(int x0) {
	int i,k, tata[50001],j,p;
	for(i=1;i<=n;i++) {
		d[i]=inf;
		tata[i]=0;
	}
	d[x0]=0;
	for(i=1;i<=n;i++) 
		for(j=1;j<=n;j++) 
			for(k=1;k<=n;k++) {
				p=dist(j,k);
				if(d[j]!=inf && p!=-1)
					if(d[k]>d[j]+p) {
						d[k]=d[j]+p;
						tata[k]=j;
					}
			}
}
int main() {
	ifstream f("dijkstra.in");
	ofstream g("dijkstra.out");
	int i,x0;
	f>>n>>m;
	x0=1;
	for(i=1;i<=m;i++)
		f>>arc[i].x>>arc[i].y>>arc[i].z;
	bellman(x0);
	for(i=2;i<=n;i++) 
		if(d[i]!=inf) g<<d[i]<<" ";
		else g<<0<<" ";
	return 0;
}