Interview Training: Arrays

[!NOTE] This module explores the core principles of Interview Training: Arrays, deriving solutions from first principles and hardware constraints to build world-class, production-ready expertise.

1. Reaching the Next Level

You have now mastered the Core Fundamentals of Arrays and Lists:

  1. Memory layouts and linear scans.
  2. The Two-Pointer pattern.
  3. The Sliding Window technique.
  4. Prefix Sums.

However, recognizing these patterns in the wild takes practice. Many interview questions disguise these core mechanics behind complex storytelling.

2. Welcome to The Problem Vault

To keep this core curriculum concise and focused on engineering principles, all highly specific LeetCode variations and niche mathematical tricks are stored in The Problem Vault.

The Vault contains complete, Gold Standard deep-dives for specific problems, featuring interactive visualizers and rigorous hardware analysis.

Array Sweeping

When you need to keep track of boundaries or gaps dynamically.

  • Missing Ranges: Learn how to use a single pointer to dynamically sweep across an array and find unmonitored gaps in O(N) time.

(More Vault Problems Coming Soon)

  • Two Sum (Variations)
  • Trapping Rain Water (Two Pointers)
  • 3Sum (Sorting + Pointers)

[!TIP] How to Practice Try to solve the problem on LeetCode first. If you get stuck for more than 20 minutes, open the associated Vault chapter. Do not look at the code yet. Read the “Intuition Through Analogy” section and play with the Visualizer, then try to code it again.