for eg , A = {9,1,2,5,5,7,2,1,1} diff = 4
Maximum number of pairs that can be formed at a time are 4 . i.e {5,1} {5,1} {7,1} {9,2}
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for eg , A = {9,1,2,5,5,7,2,1,1} diff = 4
Maximum number of pairs that can be formed at a time are 4 . i.e {5,1} {5,1} {7,1} {9,2}