Your task is to write a function that, given a distance d and a stream of floating-point values received one at a time, checks for groups of three values that are within at most d distance.
As values are received, they should be stored in memory.
Whenever any group is found meeting the distance criteria, return the three values and remove them from memory.
This problem is about streaming data processing and range matching. You must maintain the incoming floating-point values in memory and detect any triplet whose values satisfy the distance condition. A typical solution uses an ordered data structure or a sliding-window style approach to efficiently search nearby values, form a valid triplet, return it immediately, and remove those values from storage. The main challenge is supporting fast insert, neighborhood lookup, and deletion.
