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CaoJinCheng

Open on Codeforces · Unique solved

Rating2191· 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
40
Unique solved
1,255
Submissions (all)
2,834
Years with activity
2023–2026

Solved by problem rating

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

  • Unrated163
  • 800–899162
  • 900–99937
  • 1000–109930
  • 1100–119956
  • 1200–129944
  • 1300–139953

Solved by topic

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

  • greedy501
  • math471
  • dp314
  • implementation285
  • brute force259
  • data structures250
  • constructive algorithms

Rating changes

2023

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2023

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2025-12-19 17:05Codeforces Global Round 31 (Div. 1 + Div. 2)759-242191
2025-12-06 10:15Codeforces Round 1069 (Div. 1)523-792215
2025-08-07 17:35Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2)528-192294
2024-10-20 11:05Codeforces Round 980 (Div. 1)178+732313
2024-09-27 16:05Codeforces Round 975 (Div. 1)
1400–1499
57
  • 1500–159937
  • 1600–169950
  • 1700–179953
  • 1800–189954
  • 1900–199976
  • 2000–209952
  • 2100–219957
  • 2200–229948
  • 2300–239957
  • 2400–249951
  • 2500–259942
  • 2600–269925
  • 2700–279914
  • 2800–289916
  • 2900–29994
  • 3000–30994
  • 3100–31997
  • 3200–32994
  • 3300–33992
  • 245
  • binary search160
  • sortings159
  • dfs and similar128
  • combinatorics123
  • trees118
  • number theory118
  • bitmasks110
  • graphs109
  • two pointers94
  • strings78
  • games58
  • dsu57
  • divide and conquer52
  • interactive32
  • shortest paths29
  • hashing26
  • probabilities24
  • geometry22
  • fft17
  • ternary search11
  • matrices11
  • Other (10 tags)45
  • 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.

    2026

    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 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 57/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 24/day in 2025)

    2026

    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 16/day in 2026)

    276
    +60
    2240
    2024-08-30 17:05Codeforces Round 969 (Div. 1)281+782180
    2024-07-28 17:35Pinely Round 4 (Div. 1 + Div. 2)873+02102
    2024-07-18 16:35Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)1406-642102
    2024-06-09 17:35Codeforces Global Round 26670+02166
    2024-04-30 17:05Codeforces Round 942 (Div. 1)564-182166
    2024-04-29 16:35Educational Codeforces Round 165 (Rated for Div. 2)22+1492184
    2024-04-21 16:50Codeforces Round 940 (Div. 2) and CodeCraft-23121+882035