Recursion Pattern Quiz
Base/recursive/combine, memoization vs iteration, why .NET doesn't reliably tail-call optimize, and converting recursion to an explicit Stack<T> for adversarial depth.
Test: Recursion Pattern Quiz
Scenario questions with explanations that show exactly where your model of it breaks.
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All Algorithms & DS articles →Dijkstra in C#: PriorityQueue, A*, and Why Negative Edges Break It
Production Dijkstra with .NET PriorityQueue and the skip-stale pattern, path reconstruction, A* with admissible heuristics, multi-source variants, and Bellman-Ford for negatives.
Graph Traversal: BFS, DFS, Topological Sort, and the Visited Set
Adjacency list vs matrix, BFS for unweighted shortest path, DFS recursive vs iterative, Kahn's topological sort, three-colour cycle detection, and connected components.
Trees: BSTs, Balance, and Why SortedDictionary Is Red-Black
BST vs self-balancing (red-black, AVL), B-trees in databases, heaps with PriorityQueue, tries for prefix queries, and iterative traversals that don't blow the stack.
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