[leetcode-760-Find Anagram Mappings]

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.

 

Note:

1. A, B have equal lengths in range [1, 100].
2. A[i], B[i] are integers in range [0, 10^5].

思路：

hashmap映射一下就好了。。

vector<int> anagramMappings(vector<int>& A, vector<int>& B)
 {
    vector<int> ret;
    map<int,int>mp;
    for(int i = 0;i < B.size();i++)
    {
        mp[B[i]] = i;
    }
    for(int i=0;i<A.size();i++)
    {
        ret.push_back(mp[A[i]]);
    }    
    return ret;
 }