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Cod sursa(job #524638)
#include<fstream>
#include<vector>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
const int M=100001;
vector<int> v[M];
int n,m,a[M],d[M],s;
void bfs(int s)
{
int st,dr,i;
st=dr=1;
d[st]=s;
a[s]=0;
while(st<=dr)
{
for(i=0;i<v[d[st]].size();i++)
{
if(a[v[d[st]][i]]==-1)
{
d[++dr]=v[d[st]][i];
a[v[d[st]][i]]=a[d[st]]+1;
}
}
st++;
}
}
int main()
{
int i,x,y;
f>>n>>m>>s;
for(i=1;i<=m;i++)
{
f>>x>>y;
v[x].push_back(y);
}
memset(a,-1,sizeof(a));
bfs(s);
for(i=1;i<=n;i++)
g<<a[i]<<' ';
return 0;
}