100 articles · page 9 of 23
2559. Count Vowel Strings in Ranges
An in-depth algorithmic guide to LeetCode 2559: Count Vowel Strings in Ranges, covering prefix sum arrays, O(1…
1030. Matrix Cells in Distance Order
A comprehensive algorithmic guide to LeetCode 1030: Matrix Cells in Distance Order, covering Manhattan distanc…
LeetCode 1422: Maximum Score After Splitting a String (O(N) Prefix Balance)
Master LeetCode 1422 (Maximum Score After Splitting a String): single-pass O(N) algebraic reduction, prefix ba…
Why 90% of CS Graduates Struggle with Level-Order Tree Traversal
A deep dive into level-order tree traversal: why candidates struggle, modern C++ std::queue implementations, B…
LeetCode 2466: Count Ways To Build Good Strings — Tabulation DP vs Memoized DFS & Combinatorics
Comprehensive algorithmic guide for LeetCode 2466 (Count Ways To Build Good Strings): tabulation dynamic progr…
Custom Dockerfile for PHP 5.6 / Apache / WPCLI
I wanted to get my old wordpress 3.4 websites running again, so I had to build a couple docker images, and a d…
Set Matrix Zeroes: Optimal O(1) Space In-Place Algorithm, Boundary Markers & Cache Locality
Comprehensive guide to solving LeetCode 73 Set Matrix Zeroes in-place with O(1) auxiliary space, resolving (0,…
Zigzag string conversion solution in C++
The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this Input: s = "PAY…
Search a 2D Matrix: Optimal Binary Search, Staircase Elimination & Memory Locality
Algorithmic guide to searching 2D sorted matrices: virtual 1D binary search, top-right staircase elimination, …
LeetCode 543: Diameter of a Binary Tree in C++ & Post-Order DFS
Master LeetCode 543 (Diameter of a Binary Tree) in C++: post-order DFS height calculation, eliminating O(N^2) …
401. Binary Watch
An in-depth algorithmic guide to LeetCode 401: Binary Watch, featuring Cartesian search, bit manipulation, and…
Letter Combinations of a Phone Number: Combinatorial Backtracking & T9 Algorithms
Master LeetCode 17 (Letter Combinations of a Phone Number): combinatorial backtracking DFS, BFS queue generati…