Pagini recente » Cod sursa (job #1763252) | Cod sursa (job #1590372) | Cod sursa (job #3251138) | Cod sursa (job #495787) | Cod sursa (job #677587)
Cod sursa(job #677587)
#include<cstdio>
// int max=500001;
const int inf=1<<28;
FILE *in = fopen("dijkstra.in","r"), *out = fopen("dijkstra.out","w");
struct graf
{
int nod,cost;
graf *next;
};
graf *a[50001];
int n,m,d[50001],v[50001];
void add(int where, int nod, int cost)
{
graf *q;
q=new graf;
q->nod=nod;
q->cost=cost;
q->next=a[where];
a[where]=q;
}
void citire()
{
fscanf(in, "%d %d", &n, &m);
int x, y, z;
for ( int i = 1; i <= m; ++i )
{
fscanf(in, "%d %d %d", &x, &y, &z);
add(x, y, z);
}
}
/*void afisare()
{
for(int i=1; i<=n;i++)
{
graf *q=a[i];
cout<<i<<": ";
while(q)
{
cout<<q->nod<<", ";
q=q->next;
}
cout<<endl;
}
}
*/
void dijkstra()
{
for(int i=2;i<=n;i++)
d[i]=1<<30;
int min, poz_min=0;
for(int j=1;j<=n;j++)
{
min=1<<30;
for(int i=1;i<=n;i++)
if(d[i]<min&&!v[i])
{
min=d[i];
poz_min=i;
}
v[poz_min]=1;
graf *t;
t=a[poz_min];
while ( t )
{
if ( d[ t->nod ] > d[poz_min] + t->cost )
d[ t->nod ] = d[poz_min] + t->cost;
t = t->next;
}
}
}
int main()
{
citire();
dijkstra();
for ( int i = 2; i <= n; ++i )
fprintf(out, "%d ", d[i] == inf ? 0 : d[i]);
fprintf(out, "\n");
return 0;
}