Solution: Continuous Subarray Sum

Understand how to determine if a continuous subarray's sum is a multiple of a given number k using hash maps and cumulative sums. Learn to track remainders to efficiently identify qualifying subarrays, and grasp the solution's time and space complexity for coding interviews.

We'll cover the following...

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 $\leq 10^4$
...