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chenguoyi

Open on Codeforces · Unique solved

Rating2379· International Master

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
12
Unique solved
282
Submissions (all)
838
Years with activity
2022–2025

Solved by problem rating

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

  • Unrated4
  • 800–89923
  • 900–9998
  • 1000–10995
  • 1100–11995
  • 1200–12996
  • 1300–13998

Solved by topic

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

  • dp102
  • greedy96
  • math96
  • data structures72
  • constructive algorithms56
  • trees44
  • implementation

Rating changes

2022

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2022

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2025-10-03 17:35Squarepoint Challenge (Codeforces Round 1055, Div. 1 + Div. 2)176+722379
2025-08-07 17:35Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2)98+1592307
2025-07-31 17:35Codeforces Round 1040 (Div. 1)315+672148
2023-08-15 16:35Codeforces Round 893 (Div. 2)162+522081
2023-08-12 16:35Codeforces Round 892 (Div. 2)
1400–1499
10
  • 1500–15993
  • 1600–169910
  • 1700–179913
  • 1800–189911
  • 1900–199922
  • 2000–209918
  • 2100–219918
  • 2200–229918
  • 2300–239921
  • 2400–249915
  • 2500–259921
  • 2600–269911
  • 2700–27997
  • 2800–28995
  • 2900–29998
  • 3000–30992
  • 3100–31994
  • 3200–32993
  • 3300–33993
  • 40
  • binary search40
  • brute force39
  • dfs and similar38
  • graphs33
  • number theory33
  • sortings32
  • bitmasks32
  • combinatorics30
  • probabilities17
  • two pointers17
  • games13
  • strings13
  • divide and conquer12
  • dsu11
  • shortest paths9
  • interactive8
  • string suffix structures6
  • hashing5
  • flows4
  • fft3
  • ternary search2
  • Other (5 tags)7
  • 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
    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.

    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    LessMore (max 45/day in 2022)

    2023

    Download PNG

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

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

    LessMore (max 20/day in 2023)

    2024

    Download PNG

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

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

    LessMore (max 15/day in 2024)

    2025

    Download PNG

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

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

    LessMore (max 10/day in 2025)

    562
    -15
    2029
    2023-08-05 16:35Codeforces Round 890 (Div. 2) supported by Constructor Institute578-262044
    2023-07-16 16:35Codeforces Round 885 (Div. 2)280+572070
    2023-07-06 16:50Codeforces Round 882 (Div. 2)87+1942013
    2023-04-27 16:35Codeforces Round 868 (Div. 2)5+4861819
    2023-03-29 11:05Codeforces Round 861 (Div. 2)195+4491333
    2023-01-27 16:50Codeforces Round 847 (Div. 3)17045+183884
    2023-01-21 16:35Codeforces Round 845 (Div. 2) and ByteRace 2023195+701701