Pagini recente » Cod sursa (job #143371) | Cod sursa (job #587727) | Cod sursa (job #3175031) | Cod sursa (job #610728) | Cod sursa (job #2194507)
#include <fstream>
#include <vector>
using namespace std;
const int N=50001;
const int INF=10000000;
vector<int>a[N];
vector<int>c[N];
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
int h[N],nr,poz[N],v[N],n,m,d[N];
void urca(int p)
{
while(p>1 && d[h[p]]<d[h[p/2]])
{
swap(h[p],h[p/2]);
swap(poz[h[p]],poz[h[p/2]]);
p=p/2;
}
}
void coboara(int p)
{
int fs=p*2,fd=p*2+1,bun=p;
if(fs<=nr && d[h[fs]]<d[h[bun]])
bun=fs;
if(fd<=nr && v[h[fd]]<v[h[bun]])
bun=fd;
if(bun!=p)
{
swap(h[p],h[bun]);
swap(poz[h[p]],poz[h[bun]]);
coboara(bun);
}
}
void sterge(int p)
{
swap(h[p],h[nr]);
swap(poz[h[p]],poz[h[nr]]);
nr--;
coboara(p);
}
int main()
{
int x,y,cost;
in>>n>>m;
for(int i=1;i<=m;i++)
{
in>>x>>y>>cost;
a[x].push_back(y);
c[x].push_back(cost);
}
d[1]=0;
for(int i=2;i<=n;i++)
d[i]=INF;
nr=n;
for(int i=1;i<=n;i++)
{
h[i]=i;
poz[i]=i;
}
while(nr>1 && d[h[1]]<INF)
{
x=h[1];
sterge(1);
for(unsigned i=0;i<a[x].size();i++)
{
y=a[x][i];
cost=c[x][i];
if(d[x]+cost<d[y])
{
d[y]=d[x]+cost;
urca(poz[y]);
}
}
}
for(int i=2;i<=n;i++)
out<<d[i]<<' ';
return 0;
}