I often find myself confused by two words in the context of software development: "upstream" and "downstream". They bother me so much that I avoided using them in my own writing and I have to pause whenever I see them. In this blog, I'll show a simple rule that helps remember the difference: …

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Given a non-decreasing array and a target value, we can find the target in the array in logarithmic time using binary search. My first programming language is C++ and the C++ Standard Template Library (STL) provides two functions for this task. iterator lower_bound(first, last, value) returns the smallest index with a …

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Problem An event consists of multiple properties, each defined as a key-value pair, where the key is a string and the value is of a primitive type such as numbers or strings. Importantly, each event must include a mandatory 'Name' property. Given a list of events, the task is to count the number of events based on …

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