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Problem: Reverse String

Explore how to reverse a string array in place by applying recursion with two pointers swapping characters from both ends inward. Learn to write a recursive helper function that modifies the input array without extra storage beyond the call stack. Understand the process, constraints, and analyze the time and space complexity involved.

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 ...