Solution: Continuous Subarray Sum
Understand how to use hash maps and cumulative sums to determine if an integer array contains a subarray of at least length two, where the sum is a multiple of a given integer k. Learn the algorithmic logic behind tracking remainders to efficiently find and verify qualifying subarrays, preparing you for coding challenges involving modular arithmetic and subarray detection.
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Statement
Given an integer array nums and an integer k, determine if nums contains a good subarray. Return true if such a subarray exists; otherwise, return false.
A subarray of nums is considered good if:
Its length is at least
. The sum of its elements is a multiple of
k.
Notes:
A subarray is defined as a contiguous sequence of elements within an array.
An integer
xis a multiple ofkif there exists an integernsuch thatx = n * k. Note that0is always considered a multiple ofk.
Constraints: ...