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Cod sursa(job #395343)
#include<fstream>
#define dmax 100001
#include<vector>
using namespace std;
vector<long> a[dmax];
vector<long> q;
long n,m,s,inc,sfc,elem;
long cost[dmax];
int main()
{
long i,x,y;
ifstream fin("bfs.in");
fin>>n>>m>>s;
for (i=1; i<=m; i++)
{
fin>>x>>y;
a[x].push_back(y);
}
inc=0; sfc=1;
q.push_back(0); q.push_back(s);
while (inc<sfc)
{
inc++; elem=q[inc];
for (i=0; i<a[elem].size(); i++)
if (cost[a[elem][i]]==0 && a[elem][i]!=s)
{
cost[a[elem][i]]=cost[elem]+1;
sfc++;
q.push_back(a[elem][i]);
}
}
ofstream fout("bfs.out");
for (i=1; i<=n; i++)
if (i==s)
fout<<"0 "; else
if (cost[i]==0)
fout<<"-1 "; else
fout<<cost[i]<<" ";
fin.close();
fout.close();
return 0;
}