Concepts: Each tutorial is about 10 minutes time. With videos it will help to rewind and play and if you don't get it the first time!

• Episode 1: Why do we need (efficient) algorithms?
• Episode 2: Our first algorithm: Quick-sort
• Episode 3: Merge-sort
• Episode 4: Binary search
• Episode 5: Binary search extended
• Episode 6: Dynamic Programming
• Episode 7: Dynamic Programming (contd.)
• Episode 8: Graphs in a grid

Problems: All problems only involve the above concepts (in general, the problems get more difficult over time, i.e. problems from 2012 are easier than those from 2016).

Hints available:

• Secret Cow Code (Silver, January Contest: USACO 2017)
• Sequence Game (ICO 2010: India)
• Wormholes (ZCO 2012: India)
• Matched Brackets (ZCO 2012: India)
• Round Table (ZCO 2012: India)
• Matched Brackets 2 (ZCO 2012: India)
• Chewing (ZCO 2013: India)
• Little Red Riding Hood (ZCO 2013: India)
• Save Spaceman Spiff (ZCO 2013: India)
• Tournament (ZCO 2013: India)
• SUPW (ZCO 2014: India)
• IPL (ZCO 2014: India)
• Smart Phone (ZCO 2014: India)
• Video Game (ZCO 2014: India)
• Break Up (ZCO 2015: India)
• Covering (ZCO 2015: India)
• Rectangle (ZCO 2015: India)
• Variation (ZCO 2015: India)
• Bamboo Art (ZCO 2016: India)
• Bookshelves (ZCO 2016: India)
• Four Sum (ZCO 2017: India)
• Lasers (ZCO 2017: India)

Hints NOT available (yet!): None!

More practice problems

• Beginner channel of ICO Online Judge community (beginner problems)
• Intermediate concepts and problems (this community)
• Advanced concepts and problems (this community)

I have not separated the problems by topic since that significantly reduces how much better your problem solving skills are getting with each problem.

Enjoy!

P.S.: Problem Save Spaceman Spiff (ZCO 2013: India) has been removed from the above list because of weak test data and incorrect solutions passing.

Last updated: 24th December, 2016