hardM Mixed TopicsPattern: Two Pointers Meet Arrays
Identical Sum Pairs Solution
Problem Statement
Given a sequence of distinct integers `elements` and a target sum `targetSum`, find all pairs of distinct indices `(a, b)` in the sequence such that `a` is less than `b` and the sum of the values at indices `a` and `b` equals `targetSum`. The pairs should be returned in lexicographical order.
Examples
Example 1:
Input:{"elements":[1,2,3,4,5],"targetSum":7}
Output:[[0,4],[1,3]]
Example 2:
Input:{"elements":[10,20,30,40,50],"targetSum":60}
Output:[[0,2],[1,3]]
Constraints
- The array will contain integers.
- The array will have at least two elements.
- The value of k will be a positive integer.
Time: O(n log n + n) Space: O(n)
Analyze constraints and compute optimal solutions step-by-step.
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