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Cod sursa(job #323305)
#include<fstream>
#include<vector>
#define dmax 100002
#define amax 1000002
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
vector<int>ad[dmax];
vector<int>::iterator it;
struct queue
{ int nod;
int pas;
} c[dmax];
int n,m,s,minim[dmax];
bool v[dmax];
void bf()
{ int p1=1,p2=1,i;
c[1].nod=s;
c[1].pas=0;
v[s]=1;
minim[s]=0;
while(p1<=p2)
{ for(it=ad[c[p1].nod].begin();it<ad[c[p1].nod].end();it++)
{
if(v[*it]==0)
{ p2++;
c[p2].nod=*it;
v[*it]=1;
if((minim[*it]>c[p1].pas+1)||(minim[*it]==-1))
{ minim[*it]=c[p1].pas+1;
c[p2].pas=c[p1].pas+1;
}
}
}
p1++;
}
}
int main()
{ int i,x,y;
in>>n>>m>>s;
for(i=1;i<=m;i++)
{ in>>x>>y;
ad[x].push_back(y);
}
in.close();
for(i=1;i<=n;i++)
minim[i]=-1;
bf();
for(i=1;i<=n;i++)
out<<minim[i]<<" ";
out.close();
return 0;
}