238. Product of Array Except Self.cpp

class Solution {
public:
    vector<int> productExceptSelf(vector<int>& nums) {
        vector<int>res(nums.size(), 1);
        for(int i = 1; i < nums.size(); i++)
            res[i] = res[i-1] * nums[i-1];
        int right = 1;
        for(int i = nums.size() - 1; i >= 0; i--){
            res[i] *= right;
            right *= nums[i];
        }
        return res;
    }
};