题目：

思路：
https://zhuanlan.zhihu.com/p/109306706?utm_id=0

代码：

 int n = nums.length;

        int[] l = new int[nums.length];
        int[] r = new int[nums.length];


        l[0] = 1;
        r[n-1] = 1;

        for (int i=1;i<nums.length;i++) {
            l[i] = l[i-1] * nums[i-1];
        }


        for (int j=nums.length -2;j>=0;j--) {
            r[j] = r[j+1] * nums[j+1];
        }


        int[] answer = new int[nums.length];

        for (int i=0;i<n;i++) {
            answer[i] = l[i] * r[i];
        }

        return answer;