DBSCAN Region Query

Find the DBSCAN $\epsilon \backslash varepsilon$-neighbourhood of a point: the indices of all points (including the point itself) whose Euclidean distance to point i is at most eps.

Implement solve(X,i,eps).

Returns. Return an integer NumPy array of indices in increasing order.

Examples

Example 1

Input:

solve([[0.0, 0.0], [0.1, 0.0], [3.0, 3.0]], 0, 0.2)

Output:

[0, 1]

Example 2

Input:

solve([[0.0], [1.0], [2.0], [3.0]], 1, 1.0)

Output:

[0, 1, 2]