Coding Interview Prep

Master the patterns, not just the problems. This guide covers everything you need for LeetCode-style technical interviews.

Topic Frequency Distribution

Arrays & Strings

Foundation

~30%

Two Pointers

Easy-Medium

~15%

Sliding Window

Medium

~10%

Hash Maps

Easy-Medium

~15%

Trees & Graphs

Medium-Hard

~20%

Dynamic Programming

Medium-Hard

~15%

Binary Search

Medium

~10%

Backtracking

Medium-Hard

~10%

Study Order (4 Weeks)

Arrays, Strings, Hash Maps, Two Pointers

Build foundation

Sliding Window, Binary Search, Linked Lists

Pattern recognition

Trees (BFS/DFS), Graphs, Heaps

Recursive thinking

Dynamic Programming, Backtracking

Problem decomposition

Must-Know Problems (Top 20)

1.Two Sum

2.Valid Parentheses

3.Merge Two Sorted Lists

4.Best Time to Buy and Sell Stock

5.Valid Palindrome

6.Invert Binary Tree

7.Valid Anagram

8.Binary Search

9.Linked List Cycle

10.Maximum Subarray

11.Climbing Stairs

12.Coin Change

13.Number of Islands

14.LRU Cache

15.Merge Intervals

16.Word Search

17.3Sum

18.Longest Substring Without Repeating

19.Container With Most Water

20.Course Schedule