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Cod sursa(job #765403)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
#define NMAX 100005
int N, M, S;
vector<int> neigh[NMAX];
int d[NMAX];
bool inQ[NMAX];
int main()
{
ifstream in("bfs.in");
ofstream out("bfs.out");
in >> N >> M >> S;
for(int i = 0; i < M; ++i)
{
int a, b;
in >> a >> b;
neigh[a].push_back(b);
}
for(int i = 1; i <= N; ++i)
d[i] = -1;
d[S] = 0;
queue<int> Q;
Q.push(S);
inQ[S] = true;
while(!Q.empty())
{
int p = Q.front();
Q.pop();
for(unsigned i = 0; i < neigh[p].size(); ++i)
{
int f = neigh[p][i];
if(!inQ[f])
{
d[f] = d[p] + 1;
Q.push(f);
inQ[f] = true;
}
}
}
for(int i = 1; i <= N; ++i)
out << d[i] << " ";
return 0;
}