238. Product of Array Except Self

class Solution {
    public int[] productExceptSelf(int[] nums) {
      int[] result = new int[nums.length];
      result[0] = 1;
      for (int i = 1; i < nums.length; i++) {
        result[i] = result[i-1]  * nums[i - 1];
      }
      int right = 1;
      for (int i = nums.length - 1; i >= 0; i--) {
        result[i] *= right;
        right *= nums[i];
      }
      return result;
    }
}

Runtime: 1 ms, faster than 100.00% of Java online submissions for Product of Array Except Self.
Memory Usage: 49.5 MB, less than 82.92% of Java online submissions for Product of Array Except Self.
以前やったことがある