Mai intai trebuie sa te autentifici.
Cod sursa(job #605748)
Utilizator | Data | 1 august 2011 21:38:44 | |
---|---|---|---|
Problema | Algoritmul lui Dijkstra | Scor | 90 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 1.1 kb |
#include<fstream>
#include<queue>
#include<cstdlib>
using namespace std;
int n,m,x0=1;
int d[50050];
struct Nod{int x,c;};
Nod *G[50050],aux;
inline void Citire()
{
int i,x,y,c;
ifstream fin("dijkstra.in");
fin>>n>>m;
for(i=1;i<=n;i++)
{
G[i]=(Nod *)realloc(G[i],sizeof(Nod));
G[i][0].x=G[i][0].c=0;
}
for(i=1;i<=m;i++)
{
fin>>x>>y>>c;
aux.x=y;
aux.c=c;
G[x][0].x++;
G[x]=(Nod *)realloc(G[x],(G[x][0].x+1)*sizeof(Nod));
G[x][G[x][0].x]=aux;
}
fin.close();
}
inline void Bellman_Ford()
{
int i,x;
for(i=1;i<=n;i++)
d[i]=2000000000;
d[x0]=0;
queue <int> Q;
Q.push(x0);
while(!Q.empty())
{
x=Q.front();
Q.pop();
for(i=1;i<=G[x][0].x;i++)
{
aux=G[x][i];
if(d[aux.x]>d[x]+aux.c)
{
d[aux.x]=d[x]+aux.c;
Q.push(aux.x);
}
}
}
}
inline void Afisare()
{
int i;
ofstream fout("dijkstra.out");
for(i=2;i<=n;i++)
{
if(d[i]!=2000000000)
fout<<d[i]<<' ';
else
fout<<0<<' ';
}
fout<<"\n";
fout.close();
}
int main()
{
Citire();
Bellman_Ford();
Afisare();
return 0;
}