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WongChun1234

Open on Codeforces · Unique solved

Rating2441· Grandmaster

Bar charts count unique accepted problems (merged with the global problem set for rating and tags). Heatmaps use UTC calendar days. Rating squares are sums of newRating − oldRating from user.rating when System update time falls on that day. Submissions count every row from user.status (all verdicts), paginated until Codeforces has no more rows—heavy accounts can take a few seconds.

Rated contests
20
Unique solved
537
Submissions (all)
1,298
Years with activity
2021–2026

Solved by problem rating

Unique accepted problems, bucketed by catalog rating (100‑point bands). Unrated = no rating in the problem set.

  • Unrated167
  • 800–89949
  • 900–99914
  • 1000–109924
  • 1100–119927
  • 1200–129925
  • 1300–139914

Solved by topic

Each problem counts once per tag (same as Codeforces tags). Top tags shown; remaining mass in “Other”.

  • math145
  • implementation135
  • greedy130
  • constructive algorithms87
  • brute force80
  • dp71
  • data structures

Rating changes

2021

Sum of rating deltas on each UTC day (GitHub-style weeks, Sunday top).

Jan
Feb
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May

Submission volume

Download all years PNG

2021

Download PNG

Count of submissions per UTC day (includes every verdict).

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2026-01-07 17:35Hello 2026311-42441
2025-01-04 17:05Hello 2025170+732445
2024-03-16 17:00Codeforces Round 934 (Div. 1)250+172372
2024-02-17 17:35think-cell Round 1423-242355
2024-01-06 17:05Hello 2024163+982379
1400–1499
23
  • 1500–159927
  • 1600–169917
  • 1700–179928
  • 1800–189931
  • 1900–199917
  • 2000–209914
  • 2100–219911
  • 2200–229913
  • 2300–239912
  • 2400–249912
  • 2500–25993
  • 2600–26992
  • 2700–27991
  • 2800–28992
  • 3000–30992
  • 3100–31991
  • 3500–35991
  • 58
  • sortings48
  • dfs and similar44
  • binary search41
  • strings39
  • trees38
  • number theory32
  • graphs30
  • combinatorics29
  • two pointers29
  • *special21
  • bitmasks20
  • dsu19
  • games15
  • geometry12
  • shortest paths7
  • graph matchings6
  • probabilities6
  • matrices6
  • expression parsing5
  • interactive4
  • divide and conquer4
  • Other (7 tags)15
  • Jun
    Jul
    Aug
    Sep
    Oct
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    Dec

    Green: rating up · red: rating down · intensity: |Δ| tiers (<50, 50–99, 100+). One square may combine multiple rated contests on the same UTC day.

    2022

    Sum of rating deltas on each UTC day (GitHub-style weeks, Sunday top).

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    Green: rating up · red: rating down · intensity: |Δ| tiers (<50, 50–99, 100+). One square may combine multiple rated contests on the same UTC day.

    2023

    Sum of rating deltas on each UTC day (GitHub-style weeks, Sunday top).

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    Green: rating up · red: rating down · intensity: |Δ| tiers (<50, 50–99, 100+). One square may combine multiple rated contests on the same UTC day.

    2024

    Sum of rating deltas on each UTC day (GitHub-style weeks, Sunday top).

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    Green: rating up · red: rating down · intensity: |Δ| tiers (<50, 50–99, 100+). One square may combine multiple rated contests on the same UTC day.

    2025

    Sum of rating deltas on each UTC day (GitHub-style weeks, Sunday top).

    Jan
    Feb
    Mar
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    May
    Jun
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    Dec

    Green: rating up · red: rating down · intensity: |Δ| tiers (<50, 50–99, 100+). One square may combine multiple rated contests on the same UTC day.

    2026

    Sum of rating deltas on each UTC day (GitHub-style weeks, Sunday top).

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
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    Dec

    Green: rating up · red: rating down · intensity: |Δ| tiers (<50, 50–99, 100+). One square may combine multiple rated contests on the same UTC day.

    May
    Jun
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    LessMore (max 23/day in 2021)

    2022

    Download PNG

    Count of submissions per UTC day (includes every verdict).

    Jan
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    LessMore (max 22/day in 2022)

    2023

    Download PNG

    Count of submissions per UTC day (includes every verdict).

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    LessMore (max 25/day in 2023)

    2024

    Download PNG

    Count of submissions per UTC day (includes every verdict).

    Jan
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    LessMore (max 41/day in 2024)

    2025

    Download PNG

    Count of submissions per UTC day (includes every verdict).

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
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    Dec

    LessMore (max 34/day in 2025)

    2026

    Download PNG

    Count of submissions per UTC day (includes every verdict).

    Jan
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    Jun
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    LessMore (max 6/day in 2026)

    2023-12-30 16:50Good Bye 2023245+952281
    2023-04-29 16:50Codeforces Round 869 (Div. 1)482-492186
    2023-04-15 11:05Codeforces Round 866 (Div. 1)464-692235
    2022-12-30 17:05Good Bye 2022: 2023 is NEAR198+1102304
    2022-10-07 17:05Dytechlab Cup 2022297+622194
    2022-03-27 16:35Codeforces Round 779 (Div. 2)37+1142132
    2022-03-06 12:10Codeforces Round 775 (Div. 1, based on Moscow Open Olympiad in Informatics)467+252018