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chenzining

Open on Codeforces · Unique solved

Rating2184· 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
14
Unique solved
152
Submissions (all)
509
Years with activity
2023–2025

Solved by problem rating

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

  • 800–89939
  • 900–9995
  • 1000–109911
  • 1100–119914
  • 1200–12999
  • 1300–139912
  • 1400–14993

Solved by topic

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

  • greedy60
  • math51
  • implementation50
  • constructive algorithms35
  • brute force34
  • sortings31
  • dp

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
2025-04-26 11:35Codeforces Round 1021 (Div. 1)98+1782184
2025-04-19 16:35Neowise Labs Contest 1 (Codeforces Round 1018, Div. 1 + Div. 2)638+672006
2025-04-05 17:35Teza Round 1 (Codeforces Round 1015, Div. 1 + Div. 2)1081+131939
2025-03-29 16:35Codeforces Round 1014 (Div. 2)39+2381926
2025-03-25 16:50Codeforces Round 1013 (Div. 3)
1500–1599
12
  • 1600–16999
  • 1700–17999
  • 1800–18996
  • 1900–19993
  • 2000–20997
  • 2100–21995
  • 2200–22991
  • 2300–23992
  • 2800–28992
  • 2900–29991
  • 3100–31991
  • 3200–32991
  • 27
  • data structures24
  • binary search15
  • dfs and similar13
  • strings13
  • graphs12
  • number theory11
  • trees10
  • two pointers10
  • bitmasks9
  • dsu8
  • geometry5
  • combinatorics5
  • games4
  • matrices1
  • 2-sat1
  • divide and conquer1
  • probabilities1
  • shortest paths1
  • *special1
  • 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 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 34/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 15/day in 2025)

    105
    +154
    1688
    2025-03-23 08:05Codeforces Round 1012 (Div. 2)76+3051534
    2025-03-22 16:35Codeforces Round 1011 (Div. 2)2671+1481229
    2024-10-20 11:05Codeforces Round 980 (Div. 2)7699-191081
    2024-10-19 16:20Codeforces Round 979 (Div. 2)3415+2261100
    2024-06-23 17:05Codeforces Round 954 (Div. 3)16634+70874
    2024-03-01 16:35Codeforces Round 931 (Div. 2)14217+36804
    2023-11-17 16:50Codeforces Round 909 (Div. 3)11634+175768