Grokking Advanced Coding Patterns for Interviews
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Solution: Subset Sum Equal to Target
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Problem Statement

Given an array nums containing n integers, return the number of subsets having a sum equal to x.

A subset can be any combination of numbers from the array, including an empty subset. However, you need to consider all possible combinations to determine the exact number of subsets with a sum equal to x.

Examples

Example 1:

  • Input: nums = [1, 2, 3, 4, 5], x = 5
  • Expected Output: 3
  • Explanation: The subsets that sum to 5 are [5], [1, 4], and [2, 3].

Example 2:

  • Input: nums = [2, 4, 6, 10], x = 16

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