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Google面试题，求kth largest element

Posted by happyxiaoshiquan at 2010-09-10 18:53:53 
you are given 2 arrays sorted in decreasing order of size m and n 
respectively.

Input: a number k <= n*m and >= 1

Output: the kth largest sum( a+b ) possible. where
a (any element from array 1)
b (any element from array 2)

两个数组A,B 求第k个sum( a+b )。

给出高效解法!
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