Apply sliding window techniques

Q: Apply sliding window techniques

This question evaluates a candidate's understanding and application of the sliding window technique for array and string problems, including designing fixed versus dynamic windows, algorithmic complexity analysis, and handling constraints for contiguous sums and distinct-character counts.

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Question

Explain the sliding window technique and apply it to solve: (

Given an array of positive integers and a target S, return the minimal length of a contiguous subarray with sum ≥ S (or 0 if none); (
Given a string and an integer K, return the length of the longest substring containing at most K distinct characters; Analyze time and space complexity and when to use fixed vs. dynamic windows.

Apply sliding window techniques

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