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Cod sursa(job #667370)
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
int n,m,s;
vector< vector< int > > mat(100001);
vector<int> dist(100001);
int main()
{
ifstream fin("bfs.in");
ofstream fout("bfs.out");
fin>>n>>m>>s;
for(;m;--m)
{
int x,y;
fin>>x>>y;
mat[x].push_back(y);
}
queue<int> q;
q.push(s);
dist[s]=0;
while(!q.empty())
{
int x=q.front();
for(int i=0;i<mat[x].size();++i)
if(!dist[mat[x][i]] && mat[x][i]!=s)
{
dist[mat[x][i]]=1+dist[x];
q.push(mat[x][i]);
}
q.pop();
}
for(int i=1;i<=n;++i)
if(!dist[i] && i!=s)
fout<<-1<<" ";
else
fout<<dist[i]<<" ";
}