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1) Use Hashset and all all values from A and B to it in a way:
- Abhinav February 19, 2014a) If already present: delete
b) else add
2) If Hashset is non-empty, it will essentially contain two numbers. These are the two numbers that we are looking for.
2) If Hashset is empty, this means that the two numbers are the same. We can find out these numbers by subtracting the sums of the two arrays A and B and dividing the difference by 2.