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Problem: Reverse String

Explore how to reverse a character array in place by applying recursion with a two-pointer technique. Learn to implement a recursive helper function that swaps characters from both ends, progressing inward without creating extra arrays. Understand the time and space complexity implications of this approach.

Statement

Given an array of characters s, write a function to reverse the array in place.

The reversal must be performed by modifying the input array s directly, using only O(1)O(1) extra memory.

Note: Do not return a new array. Modify the input array s in place.

Constraints:

  • 11 \leq s.length 105\leq 10^5 ...