Leetcode Problem 930. Binary Subarrays With Sum

930. Binary Subarrays With Sum

Leetcode Solutions

Prefix Sums Approach

  1. Initialize a hashmap count to store the frequency of prefix sums and a variable sum to keep track of the current prefix sum.
  2. Initialize result to 0, which will hold the final count of subarrays with sum equal to goal.
  3. Iterate through the array nums, updating the prefix sum sum by adding the current element.
  4. If sum - goal is in the hashmap count, add count[sum - goal] to result.
  5. Increment the count of sum in the hashmap count.
  6. After the loop, return result as the total count of subarrays with sum goal.
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Two Pointers Approach

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