How To Find The Middle Node of a Linked List
Two C++ approaches to solve Leetcode 876. Middle of the Linked List. One uses the counting method. The other uses two-pointer technique. Both have runtime complexity O(N).
Two Pointer
How To Arrange An Array In Parity
Two approaches for solving Leetcode 922. Sort Array By Parity II. One uses Buble sort, which takes O(N^2) runtime. The other uses the Two-pointer technique to reduce runtime to O(N).