Find last modular node in linked list for given k

Check if the length of a linked list is even or odd

Array-based Trie Implementation

Count Beautiful Numbers

Count Cells in Overlapping Horizontal and Vertical Substrings

Count Partitions with Even Sum Difference

Count Special Subsequences

Count Substrings Divisible By Last Digit

Design a 3D Binary Matrix with Efficient Layer Tracking

Design an Array Statistics Tracker