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Cod sursa(job #330496)
#include<stdio.h>
#define Nmx 50001
#define INF 2000000001
int n,m,K;
int Heap[Nmx];
int Cost[Nmx],pz[Nmx];
struct nod
{
int x,c;
nod *urm;
};
nod *G[Nmx];
void add(int x,int y,int c)
{
nod *aux;
aux=new nod;
aux->x=y;
aux->c=c;
aux->urm=G[x];
G[x]=aux;
}
void citire()
{
scanf("%d%d",&n,&m);
int x,y,c;
for(int i=1;i<=m;++i)
{
scanf("%d%d%d",&x,&y,&c);
add(x,y,c);
}
}
void schimb(int x,int y)
{
Heap[x]^=Heap[y]^=Heap[x]^=Heap[y];
}
void sus(int k)
{
while(k>1)
{
if(Cost[Heap[k/2]]>Cost[Heap[k]])
{
pz[Heap[k/2]]=k;
pz[Heap[k]]=k/2;
schimb(k,k/2);
k=k/2;
}
else return ;
}
}
void jos(int k)
{
int t;
while(k<=K)
{
if(k*2<=K)
{
t=k*2;
if(k*2+1<=K)
if(Cost[Heap[t+1]]<Cost[Heap[t]])
++t;
}
else return ;
if(Cost[Heap[k]]>Cost[Heap[t]])
{
pz[Heap[k]]=t;
pz[Heap[t]]=k;
schimb(k,t);
k=t;
}
else return ;
}
}
void solve()
{
for(int i=2;i<=n;++i)
{
Cost[i]=INF;
pz[i]=-1;
}
Heap[++K]=1;
pz[1]=1;
while(K)
{
int min=Heap[1];
schimb(1,K);
pz[Heap[1]]=1;
--K;
jos(1);
for(nod *p=G[min];p;p=p->urm)
if(Cost[min]+p->c<Cost[p->x])
{
Cost[p->x]=Cost[min]+p->c;
if(pz[p->x]!=-1)
sus(pz[p->x]);
else{
Heap[++K]=p->x;
pz[p->x]=K;
sus(K);
}
}
}
}
void print()
{
for(int i=2;i<=n;++i)
{
if(Cost[i]==INF) printf("0 ");
else printf("%d ",Cost[i]);
}
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
citire();
solve();
print();
return 0;
}