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Crack the coding interview, one lesson a day.

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Python Lesson 1: Install Python & Run Your First Code (REPL + .py Files)

Python Lesson 5: User Input & Output — input(), f-strings & Your First Interactive Program

Sequential Digits Explained in Python — Sliding Window Over a String (LeetCode 1291)

Python Lesson 2: Variables & Data Types (int, float, str, bool) Explained

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Every lesson, sorted into tracks

Minimum Number of Pushes to Type Word I — 🔴 Advanced (3/3) — LeetCode Daily Python Solution (10 letters, one formula)

Minimum Number of Pushes to Type Word I — 🟢 Beginner (1/3) — LeetCode Daily Python Solution ('abcdefghi' = 10 pushes?)

Minimum Number of Pushes to Type Word I — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution ('abcdefghi' = 10 pushes)

SQL Lesson 6: Why NULL = NULL Never Returns True

Python File Handling: One Word (with) Saves Your Work

Smallest Palindromic Rearrangement II — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution (stop building the whole string)

Smallest Palindromic Rearrangement II — 🟢 Beginner (1/3) — LeetCode Daily Python Solution (why you only solve half)

Smallest Palindromic Rearrangement II — 🔴 Advanced (3/3) — LeetCode Daily Python Solution (the trick nobody sees)

SQL Lesson 5: Why Does OFFSET 1000000 Crawl?

Lesson 14: One Bad Line Can Crash Your Whole Program

Smallest Palindromic Rearrangement I — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution (half the string, mirror the rest)

Smallest Palindromic Rearrangement I — 🟢 Beginner (1/3) — LeetCode Daily Python Solution (the trick nobody sees)

Smallest Palindromic Rearrangement I — 🔴 Advanced (3/3) — LeetCode Daily Python Solution (why not just try every order?)

SQL Lesson 4: Why Do Your Rows Come Back in Random Order?

Python Lesson 13: Turn 4 Lines Into 1 With Comprehensions

SQL Lesson 3: Why Does WHERE age > 21 OR 25 Silently Return Everyone?

Lesson 12: Why Does Python Ignore Your Variable Change?

Maximum Product of Two Elements in an Array — 🔴 Advanced (3/3) — LeetCode Python Solution (One Pass Trick)

Maximum Product of Two Elements in an Array — 🟡 Intermediate (2/3) — LeetCode Python Solution (why it returns 1)

Maximum Product of Two Elements in an Array — 🟢 Beginner (1/3) — LeetCode Python Solution (why [2,2] returns 1)

SQL Lesson 2: Pull 3 Rows From 1,000,000 in One Line

SQL Lesson 1: Every App You Use Is Just Boxes in a Cabinet

Speed challenge: spot the bug in under 30 seconds, five rounds

Maximum Product of Three Numbers — 🟢 Beginner (1/3) — LeetCode Python Solution (the negative trap)

Maximum Product of Three Numbers — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution (the two-negatives trap)

Maximum Product of Three Numbers — 🔴 Advanced (3/3) — LeetCode Daily Python Solution (the two-negative trap)

74% of Women Lived. 19% of Men Didn't. The Data Explains Why

Median of Two Sorted Arrays — LeetCode Daily Python Solution (the trick nobody sees)

Lesson 11: Why Does return None Happen to Everyone?

Lesson: The 10 Python Functions You've Used 1,000 Times

Maximum Product of Two Digits — 🔴 Advanced (3/3) — LeetCode Daily Python Solution (swap one digit, +60)

Maximum Product of Two Digits — 🟡 Intermediate (2/3) — LeetCode Daily Python Solution (swap one digit, +60)

Maximum Product of Two Digits — 🟢 Beginner (1/3) — LeetCode Daily Python Solution (the trick nobody sees)

Lesson: How Does an AI Agent Catch Its Own Mistakes?

Lesson: How Do Apps Survive a Million Users Without Crashing?

Sum of GCD of Formed Pairs — LeetCode Daily Python Solution (Two Pointers Eats It Alive)

TwopointerMedium

Python Basics: Variables, Loops, Lists & Functions Explained Simply

Number of Unique XOR Triplets I — LeetCode Daily Python Solution (the trick nobody sees)

Rank Transform of an Array — Sort, Set & Hash Map in Python (Explained Simply)

How a Web Request Actually Works (in One Diagram)

Maximize Active Section with Trade II — LeetCode Daily Python Solution (the 0-1-0 sandwich trick)

Binary Search Explained Visually — 1,000,000 Items in 20 Steps

Lesson 9: Tuples and Sets — Why Does Python Have THREE Ways to Store a List?

Why Does list[5] Crash? Python Lists From Zero to Confident

Maximize Active Section with Trade I — LeetCode Daily Python Solution (Zero Bridge trick)

What If 20 Lines of Code Beat Most Traders' Intuition?

GCD of Odd and Even Sums: Why the Answer Is Always n

Sequential Digits Explained in Python — Sliding Window Over a String (LeetCode 1291)

Count Subsequence Pairs With Equal GCD — DP Explained Step by Step

Lesson: Code That Reads Like English Still Breaks You

Sorted GCD Pair Queries — LeetCode Daily Python Solution (5 Billion Pairs, No List)

Python Lesson 3: Strings & String Methods (Indexing, Slicing, F-Strings, split/join/strip)

Python Lesson 1: Install Python & Run Your First Code (REPL + .py Files)

Smallest Subsequence of Distinct Characters — LeetCode Daily Python Solution (the greedy stack trick nobody sees)

Shift 2D Grid — LeetCode Daily Python Solution (the trick nobody sees)

Python Lesson 7: while & for Loops Explained (range, break, continue)

Python Lesson 5: User Input & Output — input(), f-strings & Your First Interactive Program

Python Lesson 2: Variables & Data Types (int, float, str, bool) Explained

Python Lesson 6: Conditionals — if, elif, else, Truthiness & Nested Logic

Number of Unique XOR Triplets II — LeetCode Daily Python Solution (the trick nobody sees)

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