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Cod sursa(job #781089)
#include<fstream>
#include<vector>
#define maxn 100001
using namespace std;
int viz[maxn],c[maxn],p,u,n,m,LG[maxn];
vector <int> B[maxn];
int main()
{
ifstream f("bfs.in");
ofstream g("bfs.out");
int i,x,y,s,z,w;
f>>n>>m>>s;
for(i=1;i<=m;i++)
{
f>>x>>y;
B[x].push_back(y);
}
for(i=1;i<=n;i++)
LG[i]=B[i].size();
c[1]=s; p=u=1;
viz[s]=1;
while(p<=u)
{
z=c[p];p++;
for(i=0;i<LG[z];i++)
{
w=B[z][i];
if(!viz[w])
{
u++;
c[u]=w;
viz[w]=viz[z]+1;
}
}
}
for(i=1;i<=n;i++)
g<<viz[i]-1<<' ';
return 0;
}