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Cod sursa(job #901827)
#include<stdio.h>
#include<vector>
#define maxn 50005
#define MAXX 999999999
using namespace std;
int n,m,d[maxn],poz[maxn],x[maxn],nh,r;
vector <int > v[maxn],vc[maxn];
void cit()
{
int i,p1,p2,cc;
scanf("%d %d",&n,&m);
r=1;
for(i=1;i<=m;i++)
{
scanf("%d %d %d",&p1,&p2,&cc);
v[p1].push_back(p2);
vc[p1].push_back(cc);
}
}
void swap(int i,int j)
{
int aux;
aux=x[i];
x[i]=x[j];
x[j]=aux;
poz[x[i]]=i;
poz[x[j]]=j;
}
void heapup(int k)
{
int i;
if(k<=1)
return ;
i=k/2;
if(d[x[k]]<d[x[i]])
{
swap(i,k);
heapup(i);
}
}
void buildh(int k)
{
int i;
for(i=1;i<=n;i++)
heapup(i);
}
void heap_dw(int k)
{
int i=2*k;
if(i<=nh)
{
if(i+1<=nh && d[x[i+1]]<d[x[i]])
i++;
if(d[x[i]]<d[x[k]])
{
swap(i,k);
heap_dw(i);
}
}
}
int scoate_heap()
{
swap(1,nh);
poz[x[nh]]=0;
nh--;
return x[nh+1];
}
void dijkstra()
{
int p;
unsigned int i;
for(i=1;i<=n;i++)
{
d[i]=MAXX;
x[i]=i;
poz[i]=i;
}
d[r]=0;
nh=n;
buildh(n);
while(nh>0)
{
p=scoate_heap();
heap_dw(1);
for(i=0;i<v[p].size();i++)
{
if(d[v[p][i]]>d[p]+vc[p][i] && poz[v[p][i]])
{
d[v[p][i]]=d[p]+vc[p][i];
heapup(poz[v[p][i]]);
}
}
}
}
void afis()
{
int i;
for(i=2;i<=n;i++)
if(d[i]<MAXX)
printf("%d ",d[i]);
else
printf("0");
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
cit();
dijkstra();
afis();
fclose(stdin);
fclose(stdout);
return 0;
}