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Cod sursa(job #617272)
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
int n,m,s,d[100001],x,y;
vector <int> a[100001];
queue <int> q;
void citire()
{
ifstream in("bfs.in");
int x,y;
in >> n >> m >> s;
for (int i=1; i<=n; ++i)
d[i]=-1;
while (m--)
{
in >> x >> y;
a[x].push_back(y);
}
}
int main()
{
int i;
ofstream out("bfs.out");
citire();
d[s]=0;
q.push(s);
while (!q.empty())
{
x=q.front();
q.pop();
for (i=0; i<a[x].size(); ++i)
{
y=a[x][i];
if(d[y] == -1)
{
q.push(y);
d[y]=1+d[x];
}
}
}
for (i=1; i<=n; ++i)
out << d[i] << " ";
return 0;
}