The answer
Nested loops recalculate overlapping data repeatedly, causing O(N*K) time complexity. Sliding window maintains the state and only calculates the changes, achieving O(N).
Simulating Sliding Windows with a Single Loop
Why is Sliding Window better than nested loops?
More FAQs in Simulating Sliding Windows with a Single Loop
It is an algorithmic pattern that involves creating a 'window' over a subset of an array or string, and sliding it across the data to perform calculations efficiently.
Problems involving contiguous subarrays or substrings, such as finding the max sum of K elements, or the longest substring without repeating characters.
A fixed window stays the same size (e.g., exactly 3 elements). A dynamic window expands and contracts based on specific conditions (e.g., sum must be less than 10).
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