The O(n) Club: Unique Paths II—Help, My Robot Can’t Even (LeetCode 63 Edition)
The O(n) Club: Unique Paths II—Help, My Robot Can’t Even (LeetCode 63 Edition) ⚡ TL;DR You’re coding a grid-crawling robot, but…
The O(n) Club: Insert Interval: The Algorithmic Family Reunion You’ll Never Escape
The O(n) Club: Insert Interval — The Algorithmic Family Reunion You’ll Never Escape ⚡ TL;DR You’re handed a bunch of…
The O(n) Club: Valid Sudoku—How Not to Ruin Your Day (or Tech Interview)
The O(n) Club: Valid Sudoku—How Not to Ruin Your Day (or Tech Interview) ⚡ TL;DR Validating Sudoku isn’t about flexing galaxy-brain…
The O(n) Club: 3Sum Problem: How to Stop Triple Trouble Before It Starts
The O(n) Club: 3Sum Problem—How to Stop Triple Trouble Before It Starts ⚡ TL;DR The mission: Find all unique triples in your array that sum to…
The O(n) Club: Triangle Minimum Path Sum — The Only Pyramid Scheme You’ll Ever Love
The O(n) Club: Triangle Minimum Path Sum — The Only Pyramid Scheme You’ll Ever Love ⚡ TL;DR Solve a triangle of numbers by finding the…
The O(n) Club: Combination Sum II — Now With Extra Duplicate Chaos
The O(n) Club: Combination Sum II — Now With Extra Duplicate Chaos ⚡ TL;DR Solve for all unique combos in an array (duplicates everywhere!)…
The O(n) Club: Squares of a Sorted Array—Why Squaring Wrecks Your Sort (and How Two Pointers Play Cleanup)
The O(n) Club: Squares of a Sorted Array—Why Squaring Wrecks Your Sort (and How Two Pointers Play Cleanup) ⚡ TL;DR Got a sorted array? Need a…
The O(n) Club: Unique Permutations Without The Awkward Duplicates
The O(n) Club: Unique Permutations Without The Awkward Duplicates ⚡ TL;DR Your regular permutation code doesn’t handle duplicates—it just…
The O(n) Club: Counting Primes That Actually End Before N (and Your Sanity Leaves)
The O(n) Club: Counting Primes That Actually End Before N (and Your Sanity Leaves) ⚡ TL;DR The real LeetCode ask: count all prime numbers…
The O(n) Club: Two Sum II – Sorted Input, Sorted Output, Less Screaming
The O(n) Club: Two Sum II – Sorted Input, Sorted Output, Less Screaming ⚡ TL;DR You have a sorted array, a target, and either a Java IDE or a…