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...

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...

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...

Rotating an array in place is a classic warm‑up that tests your ability to manipulate arrays, handle wrap‑around indexing, and optimize...

Dynamic Programming (DP) is a powerful technique used to solve complex problems by breaking them down into simpler subproblems. Whether...

Graphs are one of the most versatile and commonly tested data structures in technical interviews. Whether you’re a new engineer or...

Trees are one of the most important data structures in computer science and frequently appear in technical interviews. Whether you’re a...

Searching is a fundamental operation in computer science, and understanding search algorithms is essential for coding interviews. Whether...

Sorting is a fundamental topic in computer science and a common subject in technical coding interviews. Whether you're a new engineer...