Week 4 Sheet Solution

A: https://ideone.com/7aVtOb
B: https://ideone.com/IF6K0C Another Solution: https://ideone.com/0JzAjX Another Solution: https://ideone.com/vo76DW
C: https://ideone.com/BoF7KS Another Solution: https://ideone.com/dLyJg0
D: https://ideone.com/ynYb2U
E: https://ideone.com/xroXMd
F: https://ideone.com/2uTLxo
G: https://ideone.com/iW0EuV
H: https://ideone.com/ScQDbB
I: https://ideone.com/4d9hjs
J: https://ideone.com/DOQHTZ
K: https://ideone.com/QfHGgD
L: https://ideone.com/gYtf0A