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Cod sursa(job #645314)
#include<stdio.h>
struct nod{
long inf,c;
nod *urm;
}*l[10000];
FILE *f;
long n,nh,m,x[10000],d[10000],poz[10000];
void cit(){
FILE *f;
nod *p;
long a,b,c,i;
f=fopen("dijkstra.in","r");
fscanf(f,"%ld%ld",&n,&m);
for(i=1;i<=n;i++)
l[i]=0;
for(i=1;i<=m;i++){
fscanf(f,"%ld%ld%ld",&a,&b,&c);
p=new nod;
p->inf=b;
p->c=c;
p->urm=l[a];
l[a]=p;
}
fclose(f);
}
void swap(long i,long j){
long aux;
poz[x[i]]=j;
poz[x[j]]=i;
aux=x[i];
x[i]=x[j];
x[j]=aux;
}
void HeapUp(long k){
if(k<=1)
return;
if(d[x[k]]<d[x[k/2]]){
swap(k,k/2);
HeapUp(k/2);
}
}
void HeapDw(long r,long k){
long st,dr,i;
if(2*r<=k){
st=d[x[2*r]];
if(2*r+1<=k)
dr=d[x[2*r+1]];
else
dr=st-1;
if(st<dr)
i=2*r;
else
i=2*r+1;
if(d[x[r]]>d[x[i]]){
swap(i,r);
HeapDw(i,k);
}
}
}
void BuildH(long k){
long i;
for(i=1;i<=k;i++)
HeapUp(i);
}
long scoate_heap(){
swap(1,nh);
poz[x[nh]]=0;
nh--;
HeapDw(1,nh);
return x[nh+1];
}
void dijkstra(long r){
long i,k;
nod *p;
for(i=1;i<=n;i++){
x[i]=poz[i]=i;
d[i]=2000000000;
}
d[r]=0;
BuildH(n);
nh=n;
while(nh>0){
k=scoate_heap();
p=l[k];
while(p){
if(d[p->inf]>d[k]+p->c){
d[p->inf]=d[k]+p->c;
HeapUp(poz[p->inf]);
}
p=p->urm;
}
}
}
void afis(){
long i;
f=fopen("dijkstra.out","w");
for(i=2;i<=n;i++)
if(d[i]==2000000000)
fprintf(f,"%ld ",0);
else
fprintf(f,"%ld ",d[i]);
fclose(f);
}
int main(){
cit();
dijkstra(1);
afis();
return 0;
}