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Cod sursa(job #978198)
#include <cstdio>
#include <algorithm>
#include <deque>
#include <vector>
using namespace std;
struct elem
{
int nod;
int rang;
elem(int x = 0, int y = 0)
{
nod = x;
rang = y;
}
};
deque <elem> coada;
vector <int> a[100009];
int v[100009];
int n, m, s;
void citire()
{
int i, x, y;
scanf("%d%d%d", &n, &m , &s);
s--;
for(i = 0; i < n; i++)
v[i] = -1;
for(i = 0; i < m; i++)
{
scanf("%d%d", &x, &y);
a[x-1].push_back(y-1);
}
}
void solve()
{
coada.push_back(elem(s, 0));
v[s] = 0;
int crt, rang, i, aux;
while(!coada.empty())
{
crt = coada.front().nod;
rang = coada.front().rang;
for(i = 0; i < a[crt].size(); i++)
{
aux = a[crt][i];
if(v[aux] < 0)
{
v[aux] = rang + 1;
coada.push_back(elem(aux, rang+1));
}
}
coada.pop_front();
}
}
int main()
{
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
citire();
solve();
for(int i = 0; i < n; i++)
printf("%d ", v[i]);
return 0;
}