1099. Two Sum Less Than K
Given an array A of integers and integer K, return the maximum S such that there exists i < j with A[i] + A[j] = S and S < K. If no i, j exist satisfying this equation, return -1.
Input: A = [34,23,1,24,75,33,54,8], K = 60
We can use 34 and 24 to sum 58 which is less than 60.
Input: A = [10,20,30], K = 15