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Cod sursa(job #991098)
#include <fstream>
#include <vector>
#define NMax 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector <int> G[NMax];
int N, M, X, Y,Use[NMax],Sol,Start,D[NMax],C[NMax],k;
void Read()
{
fin>>N>>M>>Start;
for(int i=1; i<=M; i++)
{
fin>>X>>Y;
G[X].push_back(Y);
}
}
void BFS(int nod)
{
Use[Start]=1;
C[1]=Start;
k=1;
for(int i=1;i<=N;i++)
D[i]=-1;
D[Start]=0;
for(int i=1;i<=k;i++)
{
int nod=C[i];
for(unsigned int j=0;j<G[nod].size();j++)
{
int vecin=G[nod][j];
if(!Use[vecin])
{
C[++k]=vecin;
Use[vecin]=1;
D[vecin]=D[nod]+1;
}
}
}
}
void Print()
{
for(int i=1;i<=N;i++)
fout<<D[i]<<" ";
fout<<'\n';
}
int main()
{
Read();
BFS(Start);
Print();
return 0;
}