760.找出变位映射
付费题。
Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order of the elements in A.
We want to find an index mapping P, from A to B. A mapping P[i] = j means the ith element in A appears in B at index j.
These lists A and B may contain duplicates. If there are multiple answers, output any of them.
For example, given
A = [12, 28, 46, 32, 50]
B = [50, 12, 32, 46, 28]
We should return
[1, 4, 3, 2, 0]
as P[0] = 1 because the 0th element of A appears at B[1], and P[1] = 4 because the 1st element of A appears at B[4], and so on.
思路:因为有重复元素,用multimap. 将数组B写入multimap,key为元素,value为下标.记为bmap.对A中每一个元素A[i],在bmap中查找A[i]在B中的下标,然后赋值给P[i]即可. (注意multimap与map的不同用法,如插入,查找等)
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