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Grokking the Coding Interview Patterns in C#

Solution: Next Permutation

Understand how to rearrange an integer array to its next lexicographically greater permutation using the two-pointer technique. Learn to identify the pivot and successor elements, swap them, and reverse the suffix in-place while maintaining constant extra memory. This lesson equips you to solve permutation problems efficiently in coding interviews.

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Statement

Your task is to rearrange an array, nums, containing positive integers to form the next lexicographically greater permutationA permutation of an array of integers refers to any ordering of its elements into a sequence or linear arrangement.. This means finding the next permutation in the sequence of all possible arrangements sorted in dictionary order.

For example, given the array [4,5,6][4, 5, 6], the next permutation is [4,6,5][4, 6, 5]. In the same way, [5,6,4][5, 6, 4] becomes [6,4,5][6, 4, 5] ...