Reversing a linked list is one of those fundamental operations that underpins many real-world tasks—reordering a playlist, undo history,...

When you need to find the one missing entry in a sequence—say missing log IDs, seats, or data packets— Missing Number  is the classic...

Finding the most frequent items in a dataset is a common real-world task—think trending topics in social media, most visited pages on a...

Finding the intersection of two arrays - i.e. the common elements between two lists - is a real-world task you’ll do when reconciling...

Finding the Kth largest element in an array is a practical problem you’ll face when you need to compute statistics on large...

Sorting an array of red, white, and blue objects—represented by 0, 1, and 2—is a classic real-world task when you need to group items by...

Merging two sorted arrays is a super-practical task you’ll do whenever you need to combine sorted streams—think merging log files, time...

The First Bad Version problem - a perfect warm-up to demonstrate binary search

Binary Search is a cornerstone algorithm that shows up in everything from database lookups to system libraries. It’s a perfect warm‑up...

Problem Statement - Search Insert Position Given a sorted array of distinct integers  and a target value , return the index  if the...

Finding the majority element—an item that appears more than half the time in an array—is a classic warm‑up that’s surprisingly useful in...

Finding the longest common prefix among an array of strings is a classic warm‑up. It pops up in real‑world scenarios like building...

I’m staring at my whiteboard, fresh off writing the brute‑force substring search: two nested loops, compare needle at every haystack...

Searching for a substring within a larger string is a fundamental task in many real‑world applications—think text editors, search...

Checking whether a string is a palindrome—ignoring punctuation, spaces, and case—is a classic coding interview warm‑up. It’s directly...

Finding the first non‑repeating character in a string is a great warm‑up that combines practical string processing with frequency...

Today, I’m tackling the Valid Anagram problem, a classic that not only tests basic string manipulation but also real‑world pattern...

In today’s session, I’m tackling the Contains Duplicate problem, a common warm‑up that helps demonstrate your grasp of array manipulation...

Let’s walk through one of the classic warm-up problems you might face in a coding interview or on the job: moving all the zeroes in an...

In today’s practice question, we talk through the reverse an array in place question - no extra arrays allowed. Problem Statement Given...