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Cod sursa(job #865521)
#include <fstream>
#include <queue>
#include <vector>
#define N_MAX 100001
using namespace std;
queue <int> q;
vector <int> v[N_MAX];
int dist[N_MAX], n, m, s;
int main()
{
int iTemp1, iTemp2, x;
ifstream in("bfs.in");
ofstream out("bfs.out");
in>>n>>m>>s;
for(int i=1;i<=n;i++)
dist[i]=-1;
for(int i=0;i<m;i++)
{
in>>iTemp1>>iTemp2;
v[iTemp1].push_back(iTemp2);
}
dist[s]=0;
q.push(s);
while(!q.empty())
{
x=q.front();
q.pop();
for(int i=0;i<v[x].size();i++)
{
if(dist[v[x][i]]==-1)
{
q.push(v[x][i]);
dist[v[x][i]]=dist[x]+1;
}
}
}
for(int i=1;i<=n;i++)
out<<dist[i]<<' ';
in.close();
out.close();
return 0;
}