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Cod sursa(job #482004)
#include<fstream>
#include<iostream>
#include<vector>
#include<queue>
using namespace std;
int main()
{
int n,m,s,dist=1;
fstream fin("bfs.in", fstream::in);
fstream fout("bfs.out", fstream::out);
vector< vector<int> > graph;
vector<int> distances;
queue<int> Q;
fin>>n>>m>>s;
graph.resize(n+1);
distances.resize(n+1);
for(int i=0; i<m; ++i)
{
int x,y;
fin>>x>>y;
graph[x].push_back(y);
}
for(int i=1; i<=n; ++i)
{
/*for(int j=0; j<graph[i].size(); ++j)
cout<<graph[i][j]<<" ";
cout<<endl;*/
distances[i]=-1;
}
Q.push(s);
for(int i=0; i<graph[s].size(); ++i)
if(graph[s][i]==s)
{
distances[s]=0;
break;
}
while(!Q.empty())
{
int node=Q.front();
Q.pop();
for(int i=0; i<graph[node].size(); ++i)
{
if(distances[graph[node][i]]==-1)
{
distances[graph[node][i]]=dist;
Q.push(graph[node][i]);
}
}
dist++;
}
for(int i=1; i<=n; ++i)
fout<<distances[i]<<" ";
fout<<endl;
fin.close();
fout.close();
return 0;
}