Courses Algorithms & Data Structures for Beginners Advanced Algorithms 📚 Core Skills 🚀 NeetCode 150 🌸 System Design 0 / 45

Practice for Free The best free resources for Coding Interviews. Period. Organized study plans and roadmaps (Blind 75, Neetcode 150, NeetCode 250). Detailed video explanations. Public …

A better way to prepare for coding interviews.

To solve this problem, I created the NeetCode 150 and NeetCode 250 lists. These lists touch upon the vast majority of the topics you will see in coding interviews.

Leetcode 20. Valid Parentheses You are given a string `s` consisting of the following characters: `' ('`, `')'`, `' {'`, `'}'`, `' ['` and `']'`. The input string `s` is valid if and only if: 1. Every open bracket is …

Leetcode 69. Sqrt (x) You are given a non-negative integer `x`, return the **square root** of `x` **rounded down** to the nearest integer. The returned integer should be non-negative as well. …

The Neetcode 250 is the Neetcode 150 plus 100 more problems. It's the most beginner friendly list, intended for people completely new to algorithms.

Leetcode 201. Bitwise AND of Numbers Range You are given two integers `left` and `right` that represent the range ` [left, right]`, return the **bitwise AND** of all numbers in this range, …

Leetcode 567. Permutation In String You are given two strings `s1` and `s2`. Return `true` if `s2` contains a permutation of `s1`, or `false` otherwise. That means if a permutation of `s1` exists …

Leetcode 9. Palindrome Number You are given an integer `x`, return `true` if `x` is a **palindrome**, and `false` otherwise. **Note:** An integer is a palindrome when it reads the …