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Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i].
Solve it without division and in O(n).
For example, given [1,2,3,4], return [24,12,8,6].
Follow up:
Could you solve it with constant space complexity? (Note: The output array does not count as extra space for the purpose of space complexity analysis.)
public class Solution {
      public int[] productExceptSelf(int[] nums) {
            int[] output = new int[nums.length];
    //Multiply left product
            int product = 1;
            for (int i = 0; i < nums.length; i++) {
                  output[i] = product;
                  product *= nums[i];
            }
    //Multiply right product
            product = 1;
            for (int i = nums.length - 1; i >= 0; i--) {
                  output[i] *= product;
                  product *= nums[i];
            }
            return output;
      }
}
238. Product of Array Except Self
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原文地址:http://www.cnblogs.com/shini/p/4691098.html