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zhouhuanyi

Open on Codeforces · Unique solved

Rating2464· 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
17
Unique solved
469
Submissions (all)
1,932
Years with activity
2019–2025

Solved by problem rating

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

  • Unrated65
  • 800–89910
  • 900–9992
  • 1000–10992
  • 1100–11993
  • 1200–12999
  • 1300–13994

Solved by topic

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

  • dp154
  • math142
  • greedy102
  • data structures100
  • constructive algorithms78
  • graphs63
  • brute force

Rating changes

2019

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

Jan
Feb
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Apr
May

Submission volume

Download all years PNG

2019

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2023-10-22 13:05Codeforces Round 905 (Div. 1)108+712464
2023-09-30 17:35Codeforces Round 901 (Div. 1)136+752393
2023-09-18 16:50CodeTON Round 6 (Div. 1 + Div. 2, Rated, Prizes!)570-302318
2023-05-08 14:05Codeforces Round 872 (Div. 1)129+822348
2022-10-23 09:50Codeforces Round 829 (Div. 1)495
1400–1499
6
  • 1500–15993
  • 1600–16993
  • 1700–179910
  • 1800–18997
  • 1900–199912
  • 2000–20996
  • 2100–21996
  • 2200–22999
  • 2300–23999
  • 2400–249923
  • 2500–259916
  • 2600–269912
  • 2700–279923
  • 2800–289923
  • 2900–299925
  • 3000–309932
  • 3100–319927
  • 3200–329927
  • 3300–339930
  • 3400–349927
  • 3500–359938
  • 60
  • combinatorics60
  • trees55
  • implementation53
  • bitmasks46
  • binary search43
  • number theory39
  • dfs and similar37
  • sortings29
  • probabilities28
  • divide and conquer26
  • two pointers25
  • strings22
  • shortest paths20
  • fft19
  • interactive19
  • dsu19
  • flows17
  • geometry11
  • hashing9
  • matrices8
  • games8
  • Other (4 tags)21
  • Jun
    Jul
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    Sep
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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.

    2020

    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.

    2021

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
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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
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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.

    2023

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

    Jan
    Feb
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    Jun
    Jul
    Aug
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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.

    2024

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
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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.

    2025

    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.

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    LessMore (max 2/day in 2019)

    2020

    Download PNG

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

    Jan
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    LessMore (max 20/day in 2020)

    2021

    Download PNG

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

    Jan
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    LessMore (max 37/day in 2021)

    2022

    Download PNG

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

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    LessMore (max 24/day in 2022)

    2023

    Download PNG

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

    Jan
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    May
    Jun
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    LessMore (max 33/day in 2023)

    2024

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
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    Dec

    LessMore (max 32/day in 2024)

    2025

    Download PNG

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

    Jan
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    May
    Jun
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    LessMore (max 6/day in 2025)

    -45
    2266
    2022-03-06 12:10Codeforces Round 775 (Div. 1, based on Moscow Open Olympiad in Informatics)90+1412311
    2022-02-12 17:05Codeforces Global Round 19813-292170
    2021-12-11 12:05Codeforces Round 758 (Div.1 + Div. 2)153+1042199
    2021-10-25 08:35Codeforces Round 751 (Div. 1)188+1102095
    2021-10-24 12:35Codeforces Round 750 (Div. 2)95+1101985
    2021-10-17 13:20Codeforces Round 749 (Div. 1 + Div. 2, based on Technocup 2022 Elimination Round 1)818+481875
    2021-10-10 11:05Educational Codeforces Round 115 (Rated for Div. 2)1102-481827