剑指offer--构建乘法数组

题目描述

给定一个数组A[0,1,...,n-1],请构建一个数组B[0,1,...,n-1],其中B中的元素B[i]=A[0]*A[1]*...*A[i-1]*A[i+1]*...*A[n-1]。不能使用除法

public class 构建乘积数组 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

	}

    public int[] multiply(int[] A) {
    	int len = A.length;
    	int[] B = new int[len];
    	B[0] = 1;
    	for (int i = 1; i < B.length; i++) {
			B[i] = A[i-1] * B[i-1];
		}
    	int temp = 1;
    	for (int i = len-1; i >= 0; i--) {
			B[i] *= temp;
			temp *= A[i];
		}
		return B;
    }
}