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g0501_0600.s0523_continuous_subarray_sum.readme.md Maven / Gradle / Ivy

523\. Continuous Subarray Sum

Medium

Given an integer array nums and an integer k, return `true` _if_ `nums` _has a **good subarray** or_ `false` _otherwise_.

A **good subarray** is a subarray where:

*   its length is **at least two**, and
*   the sum of the elements of the subarray is a multiple of `k`.

**Note** that:

*   A **subarray** is a contiguous part of the array.
*   An integer `x` is a multiple of `k` if there exists an integer `n` such that `x = n * k`. `0` is **always** a multiple of `k`.

**Example 1:**

**Input:** nums = [23,2,4,6,7], k = 6

**Output:** true

**Explanation:** [2, 4] is a continuous subarray of size 2 whose elements sum up to 6.

**Example 2:**

**Input:** nums = [23,2,6,4,7], k = 6

**Output:** true

**Explanation:** [23, 2, 6, 4, 7] is an continuous subarray of size 5 whose elements sum up to 42. 42 is a multiple of 6 because 42 = 7 \* 6 and 7 is an integer.

**Example 3:**

**Input:** nums = [23,2,6,4,7], k = 13

**Output:** false

**Constraints:**

*   1 <= nums.length <= 105
*   0 <= nums[i] <= 109
*   0 <= sum(nums[i]) <= 231 - 1
*   1 <= k <= 231 - 1