Update 1143, 252, 42

[miladra]

No description provided.

[mitchellirvin]

hi @miladra ! thanks for contributing.

1. 252 already has a solution, did you mean to extend the existing one? (currently you're creating a new file)
2. 253's method signature on leetcode.com is int[][], but you have it listed as List<Interval>. am i seeing the wrong signature? did leetcode.com change theirs from List<Interval>? (I realize this applies to the existing solution, also. I'll work on getting that fixed separately)

[miladra]

Hi @mitchellirvin, Thank you.

As for 252, I intended to extend the existing solution. I made a mistake by creating a new file.
As for 253, the question is locked in Leetcode and I don't have a subscription. My code was written using Lintcode.

[mitchellirvin]

@miladra ah, thanks for clarifying! that should be fine since the logic is the same. thanks for updating and contributing!