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Cod sursa(job #984573)
#include <fstream>
#include <vector>
#include <queue>
#include <cstring>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int N,M,S;
int D[100002];
vector <int> G[100002];
queue <int> Q;
void Read()
{
f>>N>>M>>S;
int i;
for(i=1;i<=M;i++)
{
int x,y;
f>>x>>y;
G[x].push_back(y);
}
}
void BFS()
{
memset(D,-1,sizeof(D));
Q.push(S);
D[S]=0;
while(!Q.empty())
{
int nod=Q.front();Q.pop();
for(unsigned int j=0;j<G[nod].size();j++)
if(D[G[nod][j]]==-1)
{
Q.push(G[nod][j]);
D[G[nod][j]]=D[nod]+1;
}
}
}
void Print()
{
int i;
for(i=1;i<=N;i++)
g<<D[i]<<" ";
g<<"\n";
}
int main()
{
Read();
BFS();
Print();
return 0;
}