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Round 1

Round 2

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Round 1

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If you are new to the BIO, or any of the problem explanations are unclear, you may find the Resources page helpful.

Problems

  • Integer Strings

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2024Q1Math

  • Parsing Lists

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2024Q2Implementation

  • Word Game

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2024Q3Dynamic Programming

  • Zeckendorf

    Editorial authored by Vladimir Filip. Code provided by Vladimir Filip.

      Easy2023Q1Math

  • Pentominoes

    Editorial authored by Vladimir Filip. Code provided by Vladimir Filip.

      Medium2023Q2Brute ForceImplementation

  • Dreaming Spires

    Editorial authored by Vladimir Filip. Code provided by Vladimir Filip, Alex Pylypenko.

      Medium2023Q3DFS and Similar

  • Decrypt

    Editorial authored by Yuvan Raja. Code provided by Yuvan Raja.

      Easy2022Q1Math

  • Game of Drones

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Hard2022Q2Implementation

  • Parking

    Editorial authored by Duy Nguyen. Code provided by Duy Nguyen.

      Hard2022Q3Math

  • Down Pat

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2021Q1Brute ForceImplementation

  • Tri-Iso Game

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Insane2021Q2Implementation

  • Window Dressing

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2021Q3DFS and Similar

  • Roman Look-and-Say

    Editorial authored by Seyoon Park. Code provided by Seyoon Park.

      Easy2020Q1Implementation

  • Alpha Complex

    Editorial authored by Yuvan Raja. Code provided by Yuvan Raja.

      Medium2020Q2Implementation

  • False Plan

    Editorial authored by Yuvan Raja. Code provided by Yuvan Raja.

      Medium2020Q3Dynamic Programming

  • Palindromic Numbers

    Editorial authored by Yuvan Raja. Code provided by Yuvan Raja.

      Easy2019Q1Math

  • Trail

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2019Q2Implementation

  • Block-chain

    Editorial authored by Julia Volovich. Code provided by Julia Volovich.

      Hard2019Q3DFS and Similar

  • Debt Repayment

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2018Q1Implementation

  • Decoder Ring

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2018Q2Implementation

  • Serial Numbers

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2018Q3DFS and Similar

  • Coloured Triangles

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Trivial2017Q1Implementation

  • Dots and Boxes

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2017Q2Implementation

  • Mystery Parcel

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Hard2017Q3Dynamic Programming

  • Promenade Fractions

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2016Q1Implementation

  • Migration

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2016Q2Implementation

  • Prime Connections

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2016Q3DFS and Similar

  • Block Palindromes

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2015Q1Brute ForceImplementation

  • Battleships

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2015Q2Implementation

  • Modern Art

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2015Q3Dynamic Programming

  • Lucky Numbers

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2014Q1Brute Force

  • Loops

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2014Q2Implementation

  • Increasing Passwords

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2014Q3Dynamic Programming

  • Watching The Clock

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2013Q1Brute Force

  • Neutron

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Hard2013Q2Implementation

  • Unlock

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Hard2013Q3Brute Force

  • Distinct Prime Factorisation

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2012Q1ImplementationMath

  • On The Right Track

    Editorial authored by Duy Nguyen. Code provided by Duy Nguyen.

      Medium2012Q2Implementation

  • Number Ladder

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Hard2012Q3DFS and SimilarImplementation

  • Fibonacci Letters

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2011Q1ImplementationBrute Force

  • Accordion Patience

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2011Q2Implementation

  • Upside Down

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2011Q3Dynamic Programming

  • Anagram Numbers

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Trivial2010Q1Implementation

  • Die Tipping

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2010Q2Implementation

  • Juggl(ug)ing

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2010Q3DFS and Similar

  • Digit Words

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2009Q1Brute ForceGreedy

  • Puzzle Game

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Hard2009Q2ImplementationDFS and Similar

  • Child's Play

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2009Q3Dynamic Programming

  • Goldbach Conjecture

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Trivial2008Q1Brute ForceMath

  • Enigma Machine

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2008Q2Implementation

  • Shirts

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2008Q3DFS and Similar

  • Cards

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2007Q1Implementation

  • Mu Torere

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Hard2007Q2Implementation

  • String Rewriting

    Editorial authored by Seyoon Park. Code provided by Seyoon Park.

      Insane2007Q3Dynamic ProgrammingImplementationGraphs

  • Anagrams

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Trivial2006Q1Implementation

  • Rules

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2006Q2ImplementationBrute Force

  • Drats

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2006Q3Dynamic Programming

  • Fractions

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2005Q1ImplementationMath

  • Turing Machine

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2005Q2Implementation

  • Movie Magic

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2005Q3Dynamic ProgrammingDFS and Similar

  • Mayan Calendar

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2004Q1Math

  • Four in a Line

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2004Q2Implementation

  • Morse Code

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2004Q3Dynamic ProgrammingBrute Force

  • ISBN

    Editorial authored by Alex Pylypenko. Code provided by Seyoon Park.

      Trivial2003Q1Implementation

  • Waves

    Editorial authored by Daria Sanina. Code provided by Daria Sanina.

      Hard2003Q2Brute ForceImplementation

  • New Order

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2003Q3Dynamic Programming

  • Lojban

    Editorial authored by Alexander Hopkins. Code provided by Alexander Hopkins.

      Trivial2002Q1Brute Force

  • Shuffling

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Medium2002Q2Brute ForceImplementation

  • Mops

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Medium2002Q3Dynamic Programming

  • Eenie Meenie Mainee Mo!

    Editorial authored by Adwaya Gupta. Code provided by Adwaya Gupta.

      Easy2001Q1Brute ForceDynamic Programming

  • Playfair Cipher

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Easy2001Q2Brute ForceImplementation

  • A Space Oddity

    Editorial authored by Alex Pylypenko. Code provided by Alex Pylypenko.

      Hard2001Q3GraphsDFS and Similar

  • Passwords

    Editorial authored by Shubham Kumar. Code provided by Shubham Kumar.

      Trivial2000Q1Brute Force

  • Ants

    Editorial authored by Shubham Kumar. Code provided by Shubham Kumar.

      Easy2000Q2Implementation

  • Playing Games

    Editorial authored by Shubham Kumar. Code provided by Shubham Kumar.

      Hard2000Q3Brute ForceImplementation

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