3 questions. 90 minutes.

1. Write a function that prints a chessboard pattern, with 'W' being white square and 'B' being black. Input is an integer that is the number of squares on the board. Output is a 2D char array. For example,
   input:
   2
   Output:
   W B
   B W
   The topmost left square is always 'W'.

2. LC medium - Decode ways: https://leetcode.com/problems/decode-ways/

3. LC hard - Word Search II: https://leetcode.com/problems/word-search-ii/