Valid Anagram

An anagram is a word formed by rearranging another word's letters. We can efficiently check for anagrams by counting character frequencies (no sorting!). This blog post explains a JavaScript solution using a frequency counter approach.

Single Element in a Sorted Array

This problem essentially asks you to identify an element that breaks the pattern of duplicates in the sorted array. By exploiting the fact that the array is sorted, you can design algorithms that efficiently navigate through the array to pinpoint the unique element.

Majority Element

This optimized approach involves sorting the given array in ascending order. Knowing that there exists a majority element (one appearing more than n/2 times), sorting the array allows us to identify the majority element, which will always occupy the position at index n/2 or beyond. Hence, after sorting, we return the element at index n/2, as it will be the majority element by definition.

Merge Two Sorted Lists

The algorithm merges two sorted linked lists efficiently, utilizing a dummy node and a pointer. It iterates through both lists, appending the smaller element until one list is exhausted. With a linear time complexity of O(m + n), it provides an effective solution for combining sorted linked lists while preserving order.

Reverse Linked List

Reverse Linked List: A data structure manipulation algorithm that inverses the order of elements in a linked list, changing the direction of pointers to create a reversed sequence of nodes.

Contains Duplicate

Explore two strategies for detecting duplicate elements in arrays. The sorting approach involves sorting the array and checking adjacent elements, while the hash map approach efficiently tracks duplicates during array traversal. These methods offer flexibility for varied application needs.