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Cod sursa(job #401754)
#include<fstream>
#include<vector>
#include<queue>
#define MaxN 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector<int> G[MaxN];
queue<int> qu;
int i,n,m,s,x,y,c[MaxN];
void bfs(int node)
{ vector<int>::iterator it;
qu.push(node);
c[node]=0;
while(!qu.empty())
{ x=qu.front();
for(it=G[x].begin();it!=G[x].end(); it++)
if(c[*it]==-1)
{ c[*it]=c[x]+1;
qu.push(*it);
}
qu.pop();
}
}
int main()
{ fin>>n>>m>>s;
for(i=1;i<=m;i++)
{ fin>>x>>y;
G[x].push_back(y);
}
memset(c, -1, sizeof(c));
bfs(s);
for(i=1;i<=n;i++)
fout<<c[i]<<' ';
}