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Diamond IV
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changwook987Diamond IV
changwook9877
Diamond IV 230892 until Diamond III

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2,184 Solved168 Contributions22 Reverse rivals
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Date Added# Unlocked UsersTier
  • Gomgom Silver Award (2022)
    Solved 1 or more problems in the 2nd Gomgom Cup · © Hana Kim
    553
  • Warmth in the Snow (2022)
    Warmth in the Snow (2022)
    Solved 1 or more problems in the Invitation of the Winter Forest
    462
  • 2022 Seoul Cyber University Programming Contest
    2022 Seoul Cyber University Programming Contest
    Participated in 2022 Seoul Cyber University Programming Contest, or solved 1 or more problems in its open contest
    339
  • Christmas Gift (2022)
    Earn at least 5 gifts from the Make a Tree event, 2022
    725
  • 2022 1st Calculus, Probability, and Statistics Cup
    2022 1st Calculus, Probability, and Statistics Cup
    Solved 1 or more problems in the 2022 1st Calculus, Probability, and Statistics Cup
    359
  • Spent 2022 with BOJ
    Spent 2022 with BOJ
    Solved 1 or more problems in Good Bye, BOJ 2022!
    606
  • GBS Coding Contest 2022
    GBS Coding Contest 2022
    Participated in GBS Coding Contest 2022, or solved 1 or more problems in its open contest
    292
  • Newbie Problem-solver
    Solve 10 problems
    150K
  • Beginner Problem-solver
    Beginner Problem-solver
    Solve 50 problems
    105K
  • Apprentice Problem-solver
    Apprentice Problem-solver
    Solve 100 problems
    66K
  • Skilled Problem-solver
    Skilled Problem-solver
    Solve 200 problems
    31K
  • Professional Problem-solver
    Professional Problem-solver
    Solve 500 problems
    6.5K
  • 1-Star Problem-solving Technician
    Solve 1,000 problems
    1.7K
  • 2-Star Problem-solving Technician
    2-Star Problem-solving Technician
    Solve 2,000 problems
    384
  • Boardgame Cup (2023)
    Boardgame Cup (2023)
    Solved 1 or more problems in Boardgame Cup
    584
  • The 2nd MatKor Cup : 2023 Winter
    The 2nd MatKor Cup : 2023 Winter
    Participated in the 2nd MatKor Cup, or solved 1 or more problems in its open contest
    473
  • Anime Cup (2023)
    Anime Cup (2023)
    Solved 1 or more problems in Anime Cup Season 1 or 2
    766
  • Spend 2023 with BOJ
    Spend 2023 with BOJ
    Solved 1 or more problems in Hello, BOJ 2023!
    290
  • SUAPC 2023w
    SUAPC 2023w
    Participated in SUAPC 2023 Winter, or solved 1 or more problems in its open contest
    380
  • The 1st hjroh Cup (2023)
    The 1st hjroh Cup (2023)
    Solved 1 or more problems in the 1st hjroh Cup
    255
    • 12345