Pagini recente » Cod sursa (job #2444852) | Cod sursa (job #1651046) | Cod sursa (job #1069633) | Cod sursa (job #1052221) | Cod sursa (job #2420060)
#include <bits/stdc++.h>
#define Dim 100008
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int N,M,S,Ans[Dim],a,b;
bool viz[Dim];
vector <int> V[Dim];
void BFS()
{
queue <int> qu;
qu.push(S);
viz[S]=1;
while(!qu.empty())
{
int nod=qu.front();
qu.pop();
viz[nod]=1;
for(unsigned int i=0;i<V[nod].size();i++)
{
int vecin=V[nod][i];
if(!viz[vecin])
{
viz[vecin]=1;
Ans[vecin]=Ans[nod]+1;
qu.push(vecin);
}
}
}
}
int main()
{
f>>N>>M>>S;
for(int i=1;i<=M;i++)
{
f>>a>>b;
V[a].push_back(b);
}
BFS();
for(int i=1;i<=N;i++)
if(Ans[i]==0&&i!=S) g<<-1<<" ";
else g<<Ans[i]<<" ";
return 0;
}