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Cod sursa(job #890446)
#include <cstdio>
const int maxn=50001;
const int inf=1 << 30;
FILE *f=fopen("dijkstra.in","r"), *g=fopen("dijkstra.out","w");
struct graf
{
int nod, cost;
graf *next;
};
int n,m;
graf *a[maxn];
int d[maxn], q[maxn];
void add(int where, int what, int cost)
{
graf *q= new graf;
q->nod=what;
q->cost=cost;
q->next=a[where];
a[where]=q;
}
void citire()
{
fscanf(f,"%d%d",&n,&m);
int x,y,z;
for(int i=1;i<=m;i++)
{
fscanf(f,"%d%d%d",&x,&y,&z);
add(x, y, z);
}
}
void dijkstra()
{
for(int i=2;i<=n;i++)
d[i]=inf;
int min, pmin=0;
for(int i=1;i<=n;++i)
{
min=inf;
for(int j=1;j<=n;++j)
if(d[j]<min && !q[j])
min=d[j], pmin=j;
q[pmin]=1;
graf *t=a[pmin];
while(t)
{
if(d[t->nod]>d[pmin]+t->cost)
d[t->nod]=d[pmin]+t->cost;
t=t->next;
}
}
}
int main()
{
citire();
dijkstra();
for ( int i = 2; i <= n; ++i )
fprintf(g, "%d ", d[i] == inf ? 0 : d[i]);
fprintf(g, "\n");
return 0;
}