Cod sursa(job #1142857)

Utilizator DanutsDanut Rusu Danuts Data 14 martie 2014 12:21:17
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.83 kb
#include<iostream>
#include<fstream>
#include<vector>
#include<set>

#define maxn 50010
#define INF 99999
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
vector <int> G[maxn],C[maxn];
set <pair <int,int> > T;
int x,y,c,n,m,d[maxn],val,xx;
void solve(){
	for(int i=2;i<=n;i++)
		d[i]=INF;
	
	T.insert(make_pair(0,1));
	
	while(T.size()>0){
		val=(*T.begin()).first;
		xx=(*T.begin()).second;
		T.erase(*T.begin());
		for(int i=0;i < G[xx].size();i++)
			if(d[G[xx][i]] > val+C[xx][i]){
				d[G[xx][i]]=val+C[xx][i];
				T.insert(make_pair(d[G[xx][i]],G[xx][i]));
			}
	}
}
int main (){
	f>>n>>m;
	for(int i=1;i<=m;i++){
		f>>x>>y>>c;
		G[x].push_back(y);
		C[x].push_back(c);
	}
	solve();
	for(int i=2;i<=n;i++)
		if(d[i]!=INF)
			g<<d[i]<<" ";
		else
			g<<0<<" ";
	return 0;
}