Learn how to solve the Surrounded Regions problem by marking all ‘O’s connected to the border via DFS, then flipping…
Learn how to solve the “01 Matrix” problem (LeetCode 542) by using a multi-source breadth-first search. We walk through the…
Learn how to detect a cycle in an undirected graph with a depth-first search (DFS) approach. This beginner-friendly guide walks…
Learn how to detect a cycle in an undirected graph with a breadth-first search (BFS) approach. This beginner-friendly guide walks…
Discover how to implement the classic “Flood Fill” algorithm on a 2D image grid using both Depth-First Search (DFS) and…
Learn how to solve the “Rotting Oranges” problem from LeetCode using a breadth-first search (BFS) approach. We walk through the…
Learn how to perform a DFS Traversal in Graph represented by an adjacency list using simple Python recursion. Step by…
Learn how to perform BFS Traversal in Graph represented by an adjacency list. This hands guide uses Python’s collections.deque, walks…
Learn how to calculate the diameter (longest path) of a binary tree in one pass using recursion. Clear, step-by-step code…
How to calculate the maximum depth of binary tree with simple Python recursion. This beginner-friendly article breaks down the “why”…