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Problem: Continuous Subarray Sum

med
30 min
Explore how to identify a continuous subarray with a sum that is a multiple of a given integer k. This lesson helps you understand key hashing concepts to solve array sum problems while practicing coding techniques relevant for interviews.

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 22.

  • 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:

  • 11 \leq nums.length 104\leq 10^4

  • 00 \leq nums[i] 105\leq 10^5

  • 00 \leq sum(nums[i]) 2311\leq 2^{31} - 1

  • 11 \leq k 2311\leq 2^{31} - 1

Tap here to switch tabs
Problem
Ask
Submissions

Problem: Continuous Subarray Sum

med
30 min
Explore how to identify a continuous subarray with a sum that is a multiple of a given integer k. This lesson helps you understand key hashing concepts to solve array sum problems while practicing coding techniques relevant for interviews.

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 22.

  • 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:

  • 11 \leq nums.length 104\leq 10^4

  • 00 \leq nums[i] 105\leq 10^5

  • 00 \leq sum(nums[i]) 2311\leq 2^{31} - 1

  • 11 \leq k 2311\leq 2^{31} - 1