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Data-structures
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2024-03-10 00:30:07
How to implement a cache in Python that efficiently supports both dictionary and heap operations?
Python's dict is already insertion ordered (on old versions, use collections.OrderedDict) similar to a time-sorted heap. This means the oldest inserted item is always at the front. Instead of updating...
Tags: python,  caching,  data-structures
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2024-03-11 02:00:04
Arrays - Find the number of different letters in a String given conditions; lowercase of the letter(s) cannot be ahead of the uppercase letters?
What I did was to keep track of any uppercase letters that was before their lowercase counterpart in a special collection so I could check this as part of each characters validation. My solution func...
Tags: arrays,  swift,  data-structures
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2024-03-13 12:30:04
What is the most efficient way to merge 2 large lists, based on a timestamp, in C#?
You can pre-sort heartbeats. And search for left and right range borders with BinarySearch. var heartbeatsArray = heartbeats.ToArray(); var heartbeatsTime = heartbeats.Select(hb => hb.EventDateUtc).To...
Tags: c#,  data-structures
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2024-03-16 03:30:06
Algorithm - array vs binary search in different circumstances?
Question 1: I'm wondering if my time complexities are written correctly. Thoughts ? In the tree representation, nothing prevents you from storing pointers to the min and max elements, so it can be O...
Tags: algorithm,  sorting,  data-structures
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2024-03-16 13:30:04
Algorithm - Hashtable lookup time confusing if hash function is not constant?
Hash functions used for hash tables are typically much, much simpler than sha256 or keckak256. For strings, for example, Java uses a simple 32-bit polynomial hash. The calculation is documented her...
Tags: algorithm,  data-structures,  hash
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