Leetcode Problem 923. 3Sum With Multiplicity

923. 3Sum With Multiplicity

Leetcode Solutions

Initialize a count array to store the frequency of each number in the input array.
Iterate over the input array and increment the count for each number.
Initialize a variable result to store the final count of tuples.
Iterate over all possible pairs of numbers (x, y) and calculate z such that x + y + z = target.
Based on the uniqueness of x, y, and z, calculate the contribution to result using the appropriate formula for each case.
Return result modulo 10^9 + 7.

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