Leetcode Problem 1865. Finding Pairs With a Certain Sum

1865. Finding Pairs With a Certain Sum

Leetcode Solutions

HashMap Frequency Count Approach

  1. Initialize a HashMap to store the frequency of elements in nums2.
  2. For each element in nums2, increment its frequency in the HashMap.
  3. When add is called, decrement the frequency of the old value and increment the frequency of the new value after addition.
  4. When count is called, iterate over nums1 and for each element, check if the complement (total - nums1[i]) exists in the HashMap. If it does, add its frequency to the count.
  5. Return the count.
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Brute Force Approach

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