mediumTwo PointersPattern: Two Pointers
Triple Sum Zero Solution
Problem Statement
You are given an array of integers `numbers`. Find the count of unique triplets from the array that sum to zero.
Examples
Example 1:
Input:[-1, 0, 1, 2, -1, -4]
Output:2
Explanation: Triplets [-1, -1, 2] and [-1, 0, 1] sum to zero
Constraints
- 3 <= n <= 3000
- -10^5 <= arr[i] <= 10^5
Time: O(N^2) Space: O(1)
Sort the array. Iterate i from 0 to N-2. Use left and right pointers to find pairs summing to -arr[i]. Skip duplicates to ensure unique triplets. Time: O(N^2), Space: O(1) auxiliary.
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