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Cod sursa(job #887931)
#include <iostream>
#include <fstream>
using namespace std;
#define NMAX 1005
#define INFINIT 1005
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int n,m,x,y,z,i,j;
int a[NMAX][NMAX];
void dijkstra(int x0)
{
int i,min, k, ok;
int viz[NMAX], d[NMAX], tata[NMAX];
for (i = 1; i<=n; i++) {
d[i] = a[x0][i];
tata[i] = x0;
viz[i] = 0;
}
tata[x0] = 0;
viz[x0] = 0; ok = 1;
while (ok==1) {
min = INFINIT;
for (i = 1; i<=n; i++)
if ((viz[i]==0) && (min>d[i]))
{
min = d[i];
k = i;
}
if (min != INFINIT)
{
viz[k] = 1;
for (i = 1; i<=n; i++)
if ((viz[i]==0) && (d[i]>d[k]+a[k][i]))
{
d[i] = d[k]+a[k][i];
tata[i] = k;
}
}
else ok = 0;
}
for (i=2;i<=n;i++)
{
if (d[i]==INFINIT)
{
g<<0<<" ";
}
else
{
g<<d[i]<<" ";
}
}
}
int main()
{
f>>n>>m;
for (i=1;i<=m;i++){f>>x>>y>>z; a[x][y]=z;}
for (i=1;i<=n;i++)
{
for (j=1;j<=n;j++)
{
if (a[i][j]==0)
{a[i][j]=INFINIT;}
}
}
dijkstra(1);
}