Learn to solve “Find the City With the Smallest Number of Neighbors at a Threshold Distance” using Floyd Warshall or…
Browsing: Hard
Bellman Ford Algorithm made easy: learn how to find shortest paths (and detect negatives) with clear intuition, commented Python code,…
Learn how to solve Number of Ways to Arrive at Destination with Dijkstra’s algorithm while counting paths. Clear intuition, commented…
Solve Minimum Multiplications to reach End with a clean BFS, modular math, and commented Python code. Easy steps, dry run,…
Solve “Cheapest Flights Within K Stops” (LeetCode 787) in plain Python using a BFS queue and a cost array. Learn…
Path With Minimum Effort made easy: understand LeetCode 1631 with a Dijkstra heap, 4-way moves, and fully commented Python code…
Learn how to list all “eventual safe” nodes in a directed graph. We use DFS with path-tracking to spot cycles…
We flip the graph, run Kahn’s topological BFS, and list every node guaranteed to avoid cycles. Includes clear intuition, step-by-step…
Learn how to count the number of distinct islands shape in a binary grid using DFS and shape hashing. Clear…
Learn how to find all shortest paths (Word Ladder II) from one word to another by changing one letter at…