Implement array rotations and CSV keyword search

Problem A — Rotate an array left/right by k

You are given an integer array nums of length n and an integer k.

1. Implement rotateLeft(nums, k) that returns the array after rotating it left by k positions.
2. Implement rotateRight(nums, k) that returns the array after rotating it right by k positions.

Notes / Constraints

• k can be larger than n; treat k as k % n.
• Handle edge cases like n = 0 or n = 1.
• Clarify in your solution whether you modify in-place or return a new array.

Example

• nums = [1,2,3,4,5], k = 2
• left rotate → [3,4,5,1,2]
• right rotate → [4,5,1,2,3]

Problem B — Find keyword occurrences in a CSV text

You are given a CSV document as a single string csvText.

• Rows are separated by newline characters \n.
• Columns are separated by commas ,.
• Assume fields do not contain escaped commas or quoted strings (i.e., simple CSV).

Task

Given csvText and a keyword key, return all occurrences of key in the document.

For each occurrence, return:

• row: the 0-based row number
• col: the 0-based column number
• pos: the 0-based character index within that cell where the match begins

Return results in row-major order.

Variant

Extend the function to accept multiple keywords keys[] and return occurrences for any of them (you may also include which keyword matched).

Example

csvText = "foo,bar\nxxfood,barfoo", key = "foo"

• Row 0, Col 0, Pos 0 ("foo")
• Row 1, Col 0, Pos 2 ("xxfood")
• Row 1, Col 1, Pos 3 ("barfoo")

(Exact output format is up to you; it just needs to include row/col/pos.)