Given an array S of n integers, are there elements a, b, c, and d in S
such that a + b + c + d = target?
Note:
Elements in a quadruplet (a,b,c,d)
must be in non-descending order. (ie, a ≤ b ≤ c ≤ d)
The solution set must not contain duplicate quadruplets.
For example, given array S = {1 0 -1 0 -2 2}, and target = 0.
A solution set is:
(-1, 0, 0, 1)
(-2, -1, 1, 2)
(-2, 0, 0, 2)
solution:
leetcode 4Sum 四数之和
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转载自blog.csdn.net/acttell/article/details/80956033
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