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