Leetcode 923. 3Sum With Multiplicity

Count the number of index triplets i<j<k with arr[i]+arr[j]+arr[k]==target (answer mod 1e9+7). The challenge is to handle multiplicity efficiently by using value frequencies (arr values 0..100) and combinatorial cases for equal/unequal values instead of brute-force O(n^3).

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Leetcode 923. 3Sum With Multiplicity

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