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Cod sursa(job #905944)
#include<fstream>
#include<vector>
#define maxn 100001
using namespace std;
int n,m,s;
int nrv[maxn], c[maxn], d[maxn]; //G-nr de vecini S-coada
vector <int> a[maxn]; //lista de vecini
void citire()
{
ifstream fin("bfs.in");
fin>>n>>m>>s;
int x,y;
for(int i=1;i<=m;i++)
{
fin>>x>>y;
a[x].push_back(y);
}
for(int i=1;i<=n;i++)
{
nrv[i]=a[i].size();
}
}
void bfs(int nod)
{
for(int i=1;i<=n;i++)
d[i]=-1;
int i,j,dr=1;
c[1]=nod;
d[nod]=0;
for(i=1;i<=n;i++)
for(j=0;j<nrv[c[i]];j++)
{
if(d[a[c[i]][j]]==-1)
{
c[++dr]=a[c[i]][j];
d[c[dr]]=d[c[i]]+1;
}
}
}
void afisare()
{
ofstream fout("bfs.out");
for(int i=1;i<=n;i++)
if(d[i]==0&&i!=s)
fout<<"-1 ";
else
fout<<d[i]<<" ";
}
int main()
{
citire();
bfs(s);
afisare();
return 0;
}