238. Product of Array Except Self.cpp

class Solution {
public:
    vector<int> productExceptSelf(vector<int>& nums) {

        int n = nums.size();
        vector<int> res(n,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] = res[i] * right;
            right = right * nums[i];
        }

        return res;

    }
};