[ProjectEuler][Problem 215] Crack-free Walls

Problem statement:

• Origin: https://projecteuler.net/problem=215
• HackerRank: https://www.hackerrank.com/contests/projecteuler/challenges/euler215
• Solution: DP: https://github.com/Meng-Gen/ProjectEuler/blob/master/215.cc

Similar Problem (but not the same):

• Statement: https://www.hackerrank.com/challenges/lego-blocks/problem
• Solution: https://yuting-zhang.github.io/hackerrank/2017/10/18/Hackerrank-lego-blocks.html