Pagini recente » Cod sursa (job #427545) | Cod sursa (job #792736) | Cod sursa (job #2376384) | Cod sursa (job #568621) | Cod sursa (job #2342471)
#include <vector>
#include <queue>
#include <fstream>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
#define NMax 100005
vector <int> G[NMax];
queue <int>Q;
int D[NMax],n,m,s;
void read()
{
f>>n>>m>>s;
for(int i=1;i<=m;i++)
{
int x,y;
f>>x>>y;
G[x].push_back(y);
D[i]=-1;
}
D[s]=0;
}
void bfs()
{
int nod,vecin;
Q.push(s);
while(!Q.empty())
{
nod = Q.front();
Q.pop();
for(int i=0;i<G[nod].size();i++)
{
vecin = G[nod][i];
if(D[vecin] ==-1)
{
Q.push(vecin);
D[vecin]=D[nod]+1;
bfs();
}
}
}
}
int main()
{
read();
bfs();
for(int i=1;i<=n;i++)
g<<D[i]<<' ';
return 0;
}