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1. Pair (x,y) and Pair(y,x) are considered as the same pair.
2. If there exists no such pair with sum equals to 'TARGET', then return -1.
Let ‘ARR’ = [1 2 3] and ‘TARGET’ = 4. Then, there exists only one pair in ‘ARR’ with a sum of 4 which is (1, 3). (1, 3) and (3, 1) are counted as only one pair.
LLD
Data base design for book my show
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