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Leetcode Problem 2845. Count of Interesting Subarrays

2845. Count of Interesting Subarrays

Leetcode Solutions

Prefix Sum with Modulo Count Mapping

  1. Initialize a prefix sum array prefixSums with an extra initial value of 0.
  2. Initialize a hashmap countMap to store the frequency of each modulo result, starting with countMap[0] = 1.
  3. Initialize a variable count to keep track of the number of interesting subarrays.
  4. Iterate over the input array nums: a. For each element, increment the corresponding prefix sum by 1 if nums[i] % modulo == k. b. Take the modulo of the current prefix sum with modulo. c. Calculate the adjusted value to look up in the hashmap by subtracting k from the current prefix sum modulo and then taking modulo modulo. d. Add the frequency of the adjusted value from the hashmap to count. e. Update the hashmap with the new frequency of the current prefix sum modulo.
  5. Return the total count of interesting subarrays.
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Brute Force Subarray Enumeration

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