Find Anagram Mappings

给两个数组, 互相是Anagram, 求之间的mapping.

class Solution {
    public int[] anagramMappings(int[] A, int[] B) {
        Map<Integer, Integer> map = new HashMap<>();
        for(int i = 0; i < B.length; i++) {
            map.put(B[i], i);
        }
        int[] P = new int[A.length];
        for(int i = 0; i < P.length; i++) {
            P[i] = map.get(A[i]);
        }
        return P;
    }
}