Checkout Codeforces Month of Blog Posts Pt. II (Win $500+!)
My submission — 281138271
2005B1 - The Strict Teacher (Easy Version)
My submission — 281147180
2005B2 - The Strict Teacher (Hard Version)
My submission — 281146462
My submission — 281162411
My solution has a bad time complexity. Anyways you can check what I did and what the reasoning was.
My submission — 281180437
2005E1 - Subtangle Game (Easy Version)
My submission — 281195816
2005E2 - Subtangle Game (Hard Version)
My submission — 281209324