[Leetcode]-- Median of Two Sorted Arrays

public class Solution {
        public double findMedianSortedArrays(int A[], int B[]) {
            
            int aLen = A.length;
            int bLen = B.length;
            
            if((aLen+bLen) % 2 == 0){
                return (getKthElement(A, 0, aLen-1, B, 0, bLen-1, (aLen+bLen)/2) 
                      + getKthElement(A, 0, aLen-1, B, 0, bLen-1, (aLen+bLen)/2 + 1))  / 2.0 ;
            } else {
                return getKthElement(A, 0, aLen-1, B, 0, bLen-1, (aLen+bLen)/2+1);
            }
        }
            public int getKthElement(int A[], int aBeg, int aEnd, int B[], int bBeg, int bEnd, int k){
                
                if(aBeg > aEnd){
                    return B[bBeg+(k-1)];
                }
                if(bBeg > bEnd){
                    return A[aBeg+(k-1)];
                }
                
                int aMid = (aBeg+aEnd) >>1;
                int bMid = (bBeg+bEnd) >>1;
                
                int len = aMid - aBeg + bMid -bBeg +2;
                
                if(len > k) {
                    if(A[aMid] < B[bMid]){
                        return getKthElement(A, aBeg, aEnd, B, bBeg, bMid-1, k);
                    }else{
                        return getKthElement(A, aBeg, aMid-1, B, bBeg, bEnd, k);
                    }
                }else {
                    if(A[aMid] < B[bMid]){
                        return getKthElement(A, aMid+1, aEnd, B, bBeg, bEnd, k - (aMid-aBeg+1));
                    } else {
                        return getKthElement(A, aBeg, aEnd, B, bMid+1, bEnd, k - (bMid-bBeg+1));
                    }
                }
            }
    }