Hi!\nHow someone would solve Two sum problem with more than millions of records. I know its classic problem but when it comes to scalibitly game changes. Best solution for the non sorted input which can have -ve or +ve is using HashSet. How would someone solve this problem when the input is like millions of input.?\n

Hi!\nHow someone would solve Two sum problem with more than millions of records. I know its classic problem but when it comes to scalibitly game changes. Best s