Solution: Continuous Subarray Sum

Explore how to determine if an integer array contains a continuous subarray whose sum is a multiple of a given integer k. This lesson guides you through using cumulative sums and hash maps to identify such subarrays efficiently. Learn to apply this approach within coding interviews to solve problems with optimal time and space complexity.

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Statement
Solution
- Time complexity
- Space complexity

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 $2$ .
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 x is a multiple of k if there exists an integer n such that x = n * k. Note that 0 is always considered a multiple of k.

Constraints:

$1 \leq$ nums.length $\leq 10^4$
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