Pandas1

1 Problem 1 : Make a Pandas DataFrame with two-dimensional list ( https://www.geeksforgeeks.org/make-a-pandas-dataframe-with-two-dimensional-list-python/)

2 Problem 2 :Big Countries ( https://leetcode.com/problems/big-countries/ )

3 Problem 3 :Recyclable and Low Fat Products ( https://leetcode.com/problems/recyclable-and-low-fat-products/ )

4 Problem 4 :Customer Who Never Order ( https://leetcode.com/problems/customers-who-never-order/ )