Скачать или смотреть 💧 LeetCode 42: Trapping Rain Water | Most Asked FAANG Array Problem Explained!

💧 LeetCode 42: Trapping Rain Water | Most Asked FAANG Array Problem Explained!

In this video, we dive deep into LeetCode 42: Trapping Rain Water — one of the most famous FAANG interview problems that tests your ability to combine two pointers, prefix-max arrays, and space optimization.

📌 Problem Summary:
Given an array representing the elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.

🎯 What You’ll Learn:

Brute force → Prefix Max + Suffix Max → Two-pointer optimized approach

Visual intuition behind trapped water

When and why to use two pointers instead of precomputation

Edge cases & test case dry run

Time and space complexity breakdown

How this problem appears in real interviews

💼 Frequently Asked In:

Google (L4/L5 level)

Amazon

Meta

Adobe

VMware

🔥 Why this matters:
This problem is heavily reused in multiple formats and is often a gateway to mastering two-pointer thinking under constraints.

🎓 Related to:

LeetCode 11: Container With Most Water

LeetCode 84: Largest Rectangle in Histogram

LeetCode 407: Trapping Rain Water II (harder 2D version)

📚 Part of: “DSA + Binary Search Playlist for Tech Interviews | Google, Meta, Microsoft Prep”

🔗 Problem link: https://leetcode.com/problems/trappin...