[CRBTreeMap] Segmentation fault at Leetcode #1429 about algorithms HOT 4 OPEN

I can confirm that deleting a non-existent element causes a segmentation fault sometimes. If you run rspec ten times or so you should see a segmentation fault.

from algorithms.

Causes seg fault with ruby 3.2.2

require 'algorithms'
include Containers

tree = CRBTreeMap.new

tree.push(2, 2)
tree.delete(3)

from algorithms.

A similar issue exists inside RubyRBTreeMap

require 'algorithms'
include Containers

tree = RubyRBTreeMap.new

tree.push(2,2)
tree.delete(3)

`delete_recursive': undefined method `left' for nil:NilClass (NoMethodError)

      if ( !isred(node.right) && !isred(node.right.left) )

from algorithms.

I have a fix waiting for a PR review.

from algorithms.