Pagini recente » Cod sursa (job #681974) | Istoria paginii runda/racovita_ziua_nationala_11_12 | Cod sursa (job #915649) | Borderou de evaluare (job #2319323) | Cod sursa (job #1642782)
#include <cstdio>
#include <algorithm>
#include <cmath>
#define NMAX 50005
using namespace std;
struct node
{
int x,c;
};
vector<node>v[NMAX];
int n,m,i,j,x,y,c,lg;
int d[NMAX],Poz[NMAX],H[NMAX*2];
node pp(int a,int b)
{
node X;X.x=a;X.c=b;
return X;
}
void urca(int poz)
{
while(poz > 1 && d[H[poz]] < d[H[poz/2]])
{
swap(H[poz],H[poz/2]);
swap(Poz[poz],Poz[poz/2]);
poz=poz/2;
}
}
void bagaheap(int nod)
{
++lg;
H[lg]=nod;
Poz[nod]=lg;
urca(lg);
}
void coboara(int poz)
{
while((poz*2 <= lg && d[H[poz]] > d[H[poz*2]]) || (poz*2+1 <=lg && d[H[poz]] > d[H[poz*2+1]]))
{
if(poz*2+1 > lg || (d[H[poz*2]] < d[H[poz*2+1]]))
{
swap(H[poz],H[poz*2]);
swap(Poz[H[poz]],Poz[H[poz*2]]);
poz=poz*2;
}
else
{
swap(H[poz],H[poz*2+1]);
swap(Poz[H[poz]],Poz[H[poz*2+1]]);
poz=poz*2+1;
}
}
}
int Minim()
{
int x=H[1];
swap(H[1],H[lg]);
swap(Poz[1],Poz[lg]);
--lg;
coboara(1);
Poz[x]=0;
return x;
}
int main()
{
freopen("dijkstra.in","r",stdin);
freopen("dijkstra.out","w",stdout);
scanf("%d %d",&n,&m);
for(i=1;i<=m;++i)
{
scanf("%d%d%d",&x,&y,&c);
v[x].push_back(pp(y,c));
}
d[1]=0;Poz[1]=1;
bagaheap(1);
for(i=2;i<=n;++i)
{
Poz[i]=0;d[i]=INFINITY;
}
while(lg > 0)
{
int x= Minim();
for(i=0;i<v[x].size();++i)
{
int c=v[x][i].c;
y=v[x][i].x;
if(d[x] + c < d[y])
{
d[y]=d[x]+c;
if(Poz[y] == 0) bagaheap(y);
else urca(Poz[y]);
}
}
}
for(i=2;i<=n;++i)
if(d[i] == INFINITY) printf("0 ");
else printf("%d ",d[i]);
return 0;
}