completed 2-pointers

[anjanaouseph]

No description provided.

[super30admin]

• The student's solution for problem37.py is excellent. It correctly implements the merging of two sorted arrays in-place with optimal time and space complexity. The comments provided are clear and explain the reasoning behind starting from the end of the arrays.
• The student has also included solutions for other problems (problem38.py and problem39.py), which are not part of the current evaluation but show a good understanding of similar problems.
• One minor suggestion would be to ensure that all solutions are consistently formatted and commented, as seen in problem37.py, to maintain high code quality across all files.