Given two sorted positive integer arrays A(n) and B(n). We define a set S = {(a,b) | a in A and b in B}. Obviously there are n^2 elements in S. The value of such a pair is defined as Val(a,b) = a + b. Now we want to get the n pairs from S with largest values. The tricky part is that we need an O(n) algorithm.
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