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Cod sursa(job #892548)
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int>L[100001];
struct codita
{
int nr,cost;
bool ok;
} C[100001],viz[100001];
int n,m,s,ic,sc,v,v1,i;
void bfs(int x)
{
C[1].nr=x; C[1].cost=0;viz[x].ok=1;viz[x].cost=0;
ic=1;sc=1;
while(ic<=sc)
{
v=C[ic].nr;
v1=C[ic++].cost;
for(i=0;i<L[v].size();i++)
{
if(viz[L[v][i]].ok==0)
{
C[++sc].nr=L[v][i];C[sc].cost=v1+1;
viz[L[v][i]].ok=1; viz[L[v][i]].cost=v1+1;
}
}
}
for(i=1;i<=n;i++)
{
if(viz[i].cost==0&&i!=s) fout<<"-1"<<" ";
else fout<<viz[i].cost<<" ";
}
}
int main()
{
int x,y;
fin>>n>>m>>s;
for(i=1;i<=m;i++)
{
fin>>x>>y;
L[x].push_back(y);
}
bfs(s);
}