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Cod sursa(job #885327)
#include<iostream>
#include <fstream>
#include <queue>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
queue<int>q;
vector<int> a[100001];
int x0,n,d[100001];
void citire()
{
int m,i,x,y;
in>>n>>m>>x0;
for(i=1;i<=m;i++)
{
in>>x>>y;
a[x].push_back(y);
}
}
void init()
{
for(int i=1 ; i<=n ; i++)
d[i] = -1;
}
void bfs(int x0)
{
int x,y;
init();
q.push(x0);
d[x0]=0;
while(!q.empty())
{
x=q.front();
q.pop();
for(size_t i=0;i<a[x].size();i++)
{
y=a[x][i];
if(d[y]==-1)
{
q.push(y);
d[y]=1+d[x];
}
}
}
}
int main()
{
citire();
bfs(x0);
for(int i=1 ; i<=n ; i++) out << d[i] << " ";
return 0;
}