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Cod sursa(job #628894)
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector <int>v[10000];
int n,m,s;
int viz[100010],c[100000000], d[100010];
int main()
{
int x,y,sf,i,j;
f>>n>>m>>s;
for ( i=1; i<=m; i++)
{ f>>x>>y;
v[x].push_back(y);
}
for ( i=1; i<=n; i++)
{
viz[i] = 0;
d[i]=10000000;
}
viz[s]=1;
d[s]=0;
c[1]=s; sf = 1;
for (j=1; j<=sf; j++)
for (i = 0; i < v[c[j]].size(); i++)
if (viz[v[c[j]][i]] == 0)
{
sf++;
c[sf]=v[c[j]][i];
viz[v[c[j]][i]]=1;
d[v[c[j]][i]] = d[c[j]]+1;
}
for (i=1; i<=n; i++)
if (d[i]!= 10000000)
g<<d[i]<<" ";
else g<<-1<<" ";
return 0;
}