Problem 1: Array Rotations

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.

Constraints & Notes

• k can be larger than n; treat k as k % n.
• Handle edge cases such as n = 0 or n = 1.
• Clarify in your solution whether you modify the array 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 2: CSV Keyword Search

You are given a CSV document as a single string csvText and a keyword key.

• 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

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

Results should be returned in row-major order. The exact output format (e.g., list of objects, tuples) is flexible, as long as it includes row, col, and pos.

Variant

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

Example

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

Expected occurrences:

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