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Site title: Useful code – Programming with VBA, C# and Python

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The Perfect Hash Function
In the article from 1984, Fredman and Komlos (1) mention the perfect hash function, that actually can store a sparse table with 0(1) worst case access time. And as they mention that both the data structure and the query algorithm…Read more ›

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Elasticsearch – Simple Introduction and Web App
Searching through 399 documents or 40 web pages (the numbers are not random) can be a tough task if you rely on standard tools like ctrl+f. When the data grows, you need a dedicated search engine that understands relevance, handles…Read more ›

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Python – A Beam Search in Graph
In our previous article, we explored the A* (A-Star) Algorithm. It is the gold standard for pathfinding as it is optimal – it always finds the shortest path. But in the real world (chess engines, LLM) it might be too…Read more ›

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Python – A Star Search in Graph
A* is probably my favourite graph search algorithm. Some 10+ years ago, I have implmented it with Excel and after that I have written a few more implementations. Just, not to repeat myself, I will not discuss it here. The reason…Read more ›

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Dijkstra’s Graph Algorithm with Python
In the previous articles, we have presented graphs with BFS and DFS. The BFS is actually good to find the path with the fewest nodes. But if the path with the fewest nodes is actually the most expensive, then we…Read more ›

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