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Leetcode Problem 560. Subarray Sum Equals K

560. Subarray Sum Equals K

Leetcode Solutions

Using Hashmap to Find Subarray Sums Equal to K

  1. Initialize a variable count to 0 to store the total count of subarrays.
  2. Initialize a hashmap sum_occurrences with a key-value pair {0: 1} to handle the case when a subarray starts from index 0.
  3. Initialize a variable cumulative_sum to 0 to store the sum of elements up to the current index.
  4. Iterate through each element in the array nums. a. Add the current element to cumulative_sum. b. Check if cumulative_sum - k is present in sum_occurrences. i. If it is, add the value of sum_occurrences[cumulative_sum - k] to count. c. Update sum_occurrences with the current cumulative_sum. i. If cumulative_sum is already a key, increment its value. ii. If cumulative_sum is not a key, add it with the value 1.
  5. Return the value of count.
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Cumulative Sum Approach to Find Subarray Sums Equal to K

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