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Problem: Continuous Subarray Sum

Medium
30 min
Explore how to identify continuous subarrays with sums that are multiples of a given integer k using hash maps. Learn to implement efficient solutions that handle constraints and apply this pattern to common coding interview problems.

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

Problem
Ask
Submissions

Problem: Continuous Subarray Sum

Medium
30 min
Explore how to identify continuous subarrays with sums that are multiples of a given integer k using hash maps. Learn to implement efficient solutions that handle constraints and apply this pattern to common coding interview problems.

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