Leetcode Problem 1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers

1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers

Leetcode Solutions

Two Sum Approach with Frequency Counting

  1. Define a function countTriplets that takes two arrays A and B as input.
  2. Initialize a counter to keep track of the number of valid triplets.
  3. Create a frequency map for array B.
  4. Iterate over each number a in array A: a. Calculate the target square t as a * a. b. Iterate over the frequency map of B: i. If t is divisible by b and t / b is in the map, increment the counter by the product of their frequencies. ii. If b is the square root of t, increment the counter by the combination count cnt * (cnt - 1) / 2.
  5. Return the counter divided by 2 to account for double counting.
  6. The final result is the sum of countTriplets(nums1, nums2) and countTriplets(nums2, nums1).
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Brute Force with Optimization for Duplicates

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