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Cod sursa(job #709921)
#include <fstream>
#include <iostream>
#include<vector>
#include<queue>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
const int N=100099;
vector <int> a[N];
queue <int> q;
int n,v[N],s;
void citire()
{
int m,x,y;
f>>n>>m>>s;
for(int i=1; i<=m; ++i)
{
f>>x>>y;
a[x].push_back(y);
}
for(int i=1; i<=n; ++i)
v[i]=-1;
}
void bfs(int s)
{
int x,y;
v[s]=0;
q.push(s);
while(!q.empty())
{
x=q.front();
q.pop();
for( size_t i=0; i<a[x].size(); ++i)
{
y=a[x][i];
if ( v[y]==-1)
{
q.push(y);
v[y]=1+v[x];
}
}
}
}
void afisare()
{
for(int i=1; i<=n; ++i)
g<<v[i]<<" ";
}
int main()
{
citire();
bfs(s);
afisare();
return 0;
}