Here's the list of IOI problems from 2006 sorted by their difficulty (average score)↵
↵
<spoiler summary="Spoiler">↵
~~~~~↵
2010 Memory 93.19↵
2010 Cluedo 92.69↵
2009 Garage 91.55↵
2009 Poi 90.05↵
2006 Deciphering the Mayan Writing 80.62↵
2020 Connecting Supertrees 77.93↵
2010 Traffic Congestion 75.91↵
2019 Arranging Shoes 74.47↵
2018 Combo 74.12↵
2009 Raisins 70.55↵
2007 Miners 68.31↵
2016 Detecting Molecules 66.02↵
2013 Cave 64.39↵
2014 Gondola 64.26↵
2016 Paint by Number 63.6↵
2011 Parrots 59.9↵
2011 Ricehub 56.88↵
2010 Hotter Colder 55.23↵
2011 Crocodile 55.15↵
2017 The Big Prize 54.27↵
2008 Type Printer 53.78↵
2019 Vision Program 53.44↵
2012 Crayfish Scrivener 51.7↵
2010 Quality of Living 51.3↵
2020 Stations 51.27↵
2015 Horses 50.57↵
2020 Counting Mushrooms 49.65↵
2008 Linear Garden 47.6↵
2015 Sorting 47.07↵
2009 Mecho 46.09↵
2006 Pyramid 45.93↵
2007 Aliens 45.92↵
2015 Boxes with Souvenirs 44.32↵
2013 Robots 43.53↵
2010 Maze 42.75↵
2007 Pairs 42.26↵
2016 Unscrambling a Messy Bug 42.16↵
2013 Dreaming 41.15↵
2019 Broken Line 41.05↵
2011 Tropical Garden 40.62↵
2010 Languages 40.08↵
2014 Wall 39.76↵
2006 The Valley of Mexico 39.26↵
2015 Scales 37.51↵
2019 Rectangles 36.92↵
2014 Game 36.57↵
2017 Nowruz 34.51↵
2014 Friend 33.36↵
2010 Saveit 33.22↵
2014 Rail 32.71↵
2013 Art Class 32.48↵
2018 Mechanical Doll 31.54↵
2012 Ideal City 31.39↵
2018 Werewolf 30.6↵
2020 Carnival Tickets 29.6↵
2012 Pebbling Odometer 29.52↵
2013 Wombats 29.42↵
2009 Hiring 28.86↵
2013 Game 28↵
2019 Split the Attractions 26.63↵
2011 Elephants 26.54↵
2017 Wiring 26.4↵
2017 Ancient Books 26.21↵
2006 Forbidden Subgraph 26.15↵
2012 Jousting Tournament 26.1↵
2011 Race 25.85↵
2016 Roller Coaster Railroad 25.53↵
2020 Packing Biscuits 22.85↵
2014 Holiday 22.7↵
2015 Teams 22.62↵
2009 Salesman 22.42↵
2018 Meetings 21.71↵
2007 Flood 20.65↵
2007 Sails 19.73↵
2006 A Black Box Game 19.11↵
2012 Parachute Rings 18.47↵
2017 Simurgh 18.4↵
2016 Shortcut 18.35↵
2016 Aliens 17.86↵
2008 Islands 17.11↵
2018 Highway Tolls 15.66↵
2009 Regions 15.06↵
2020 Comparing Plants 14.54↵
2008 Teleporters 14.53↵
2018 Seats 14.33↵
2015 Towns 13.42↵
2019 Sky Walking 12.69↵
2012 Last Supper 12.5↵
2009 Archery 11.37↵
2017 Toy Train 10.43↵
2008 Pyramid Base 9.82↵
2006 Joining Points 8↵
2007 Training 5.31↵
2008 Fish 3.02↵
~~~~~↵
</spoiler>↵
↵
Here's the average score for a single problem per year↵
↵
<spoiler summary="Spoiler">↵
↵
</spoiler>↵
↵
Another useful thing will be to classify problems by tags. But i don't think i'm qualified enough to tag problems. So i prepared a google forms so others can contribute. If it doesn't becomes successful i'll try to do it myself and share :D .↵
↵
[Google form](https://forms.gle/PZwgQn9uLk4dTE947)↵
↵
Note: Form is only for a single problem. You can submit another responses again. Please don't spam or provide fake tags.
↵
<spoiler summary="Spoiler">↵
~~~~~↵
2010 Memory 93.19↵
2010 Cluedo 92.69↵
2009 Garage 91.55↵
2009 Poi 90.05↵
2006 Deciphering the Mayan Writing 80.62↵
2020 Connecting Supertrees 77.93↵
2010 Traffic Congestion 75.91↵
2019 Arranging Shoes 74.47↵
2018 Combo 74.12↵
2009 Raisins 70.55↵
2007 Miners 68.31↵
2016 Detecting Molecules 66.02↵
2013 Cave 64.39↵
2014 Gondola 64.26↵
2016 Paint by Number 63.6↵
2011 Parrots 59.9↵
2011 Ricehub 56.88↵
2010 Hotter Colder 55.23↵
2011 Crocodile 55.15↵
2017 The Big Prize 54.27↵
2008 Type Printer 53.78↵
2019 Vision Program 53.44↵
2012 Crayfish Scrivener 51.7↵
2010 Quality of Living 51.3↵
2020 Stations 51.27↵
2015 Horses 50.57↵
2020 Counting Mushrooms 49.65↵
2008 Linear Garden 47.6↵
2015 Sorting 47.07↵
2009 Mecho 46.09↵
2006 Pyramid 45.93↵
2007 Aliens 45.92↵
2015 Boxes with Souvenirs 44.32↵
2013 Robots 43.53↵
2010 Maze 42.75↵
2007 Pairs 42.26↵
2016 Unscrambling a Messy Bug 42.16↵
2013 Dreaming 41.15↵
2019 Broken Line 41.05↵
2011 Tropical Garden 40.62↵
2010 Languages 40.08↵
2014 Wall 39.76↵
2006 The Valley of Mexico 39.26↵
2015 Scales 37.51↵
2019 Rectangles 36.92↵
2014 Game 36.57↵
2017 Nowruz 34.51↵
2014 Friend 33.36↵
2010 Saveit 33.22↵
2014 Rail 32.71↵
2013 Art Class 32.48↵
2018 Mechanical Doll 31.54↵
2012 Ideal City 31.39↵
2018 Werewolf 30.6↵
2020 Carnival Tickets 29.6↵
2012 Pebbling Odometer 29.52↵
2013 Wombats 29.42↵
2009 Hiring 28.86↵
2013 Game 28↵
2019 Split the Attractions 26.63↵
2011 Elephants 26.54↵
2017 Wiring 26.4↵
2017 Ancient Books 26.21↵
2006 Forbidden Subgraph 26.15↵
2012 Jousting Tournament 26.1↵
2011 Race 25.85↵
2016 Roller Coaster Railroad 25.53↵
2020 Packing Biscuits 22.85↵
2014 Holiday 22.7↵
2015 Teams 22.62↵
2009 Salesman 22.42↵
2018 Meetings 21.71↵
2007 Flood 20.65↵
2007 Sails 19.73↵
2006 A Black Box Game 19.11↵
2012 Parachute Rings 18.47↵
2017 Simurgh 18.4↵
2016 Shortcut 18.35↵
2016 Aliens 17.86↵
2008 Islands 17.11↵
2018 Highway Tolls 15.66↵
2009 Regions 15.06↵
2020 Comparing Plants 14.54↵
2008 Teleporters 14.53↵
2018 Seats 14.33↵
2015 Towns 13.42↵
2019 Sky Walking 12.69↵
2012 Last Supper 12.5↵
2009 Archery 11.37↵
2017 Toy Train 10.43↵
2008 Pyramid Base 9.82↵
2006 Joining Points 8↵
2007 Training 5.31↵
2008 Fish 3.02↵
~~~~~↵
</spoiler>↵
↵
Here's the average score for a single problem per year↵
↵
<spoiler summary="Spoiler">↵
↵
</spoiler>↵
↵
Another useful thing will be to classify problems by tags. But i don't think i'm qualified enough to tag problems. So i prepared a google forms so others can contribute. If it doesn't becomes successful i'll try to do it myself and share :D .↵
↵
[Google form](https://forms.gle/PZwgQn9uLk4dTE947)↵
↵
Note: Form is only for a single problem. You can submit another responses again. Please don't spam or provide fake tags.
