LeetCode Grinding

My solutions and study notes, from linked lists and heaps to backtracking.

Solutions and study notes

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28 posts

November 20, 20252:00 AM4 min read

Algorithms

Compare sequential, pairwise, and heap methods for merging sorted linked lists.

November 19, 202510:36 AM6 min read

Algorithms

Count valid queen arrangements with backtracking, column checks, and diagonal masks.

November 10, 20256:09 PM7 min read

Algorithms

Compare a regular expression, explicit parsing, a state machine, and boolean flags for validating numeric strings.

November 10, 20255:09 PM3 min read

Algorithms

Rotate an array to the right with three reversals and constant extra space.

October 18, 20245:43 PM3 min read

Algorithms

Use backtracking to find chessboard arrangements where no two queens attack each other.

August 19, 202410:43 AM2 min read

Data Structures

Build a min heap and use it to insert items and remove the smallest item by priority.

Showing 1 to 6 of 28 posts