What is Separation of Concerns?
It is a design principle where a program is divided into distinct sections, each handling a specific task (e.g., separating data parsing from algorithmic computation).
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More FAQs in Writing Testable Functions for Competitive Programming
Mixing input/output handling with algorithmic logic makes the code difficult to read, hard to test with custom inputs, and harder to debug.
A pure function is a function that always produces the same output for the same input and has no side effects (like modifying global variables or printing to the console).
They test your code by directly calling the specific function (e.g., 'solve(input)') with various test cases and checking the returned value, completely ignoring I/O.
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