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qiuyuanzhi

Open on Codeforces · Unique solved

Rating2250· 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
20
Unique solved
421
Submissions (all)
888
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.

  • Unrated11
  • 800–89958
  • 900–99913
  • 1000–109916
  • 1100–119910
  • 1200–129915
  • 1300–139912

Solved by topic

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

  • math153
  • greedy146
  • dp119
  • data structures110
  • implementation94
  • constructive algorithms89
  • brute force

Rating changes

2023

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

2023

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2024-11-01 16:35Codeforces Round 983 (Div. 2)13+1652250
2024-10-19 16:20Codeforces Round 979 (Div. 2)141+572085
2024-10-06 08:05Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round)692-332028
2024-09-27 16:05Codeforces Round 975 (Div. 2)20+1722061
2024-09-14 16:35Codeforces Round 972 (Div. 2)
1400–1499
4
  • 1500–15997
  • 1600–169911
  • 1700–179912
  • 1800–18998
  • 1900–19995
  • 2000–209912
  • 2100–219917
  • 2200–229926
  • 2300–239927
  • 2400–249936
  • 2500–259929
  • 2600–269910
  • 2700–27999
  • 2800–289910
  • 2900–29997
  • 3000–309919
  • 3100–31997
  • 3200–32998
  • 3300–339914
  • 3400–34992
  • 3500–35996
  • 81
  • number theory52
  • combinatorics49
  • graphs44
  • binary search43
  • sortings41
  • strings38
  • trees34
  • dfs and similar32
  • bitmasks31
  • two pointers30
  • divide and conquer21
  • games18
  • geometry16
  • *special16
  • interactive15
  • dsu15
  • flows14
  • probabilities14
  • hashing13
  • shortest paths5
  • graph matchings4
  • Other (7 tags)19
  • Jun
    Jul
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    Sep
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    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 18/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 55/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 19/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 10/day in 2026)

    397
    +73
    1889
    2024-08-30 17:05Codeforces Round 969 (Div. 2)579+321816
    2024-08-25 16:35Codeforces Round 968 (Div. 2)407+1061784
    2023-09-30 17:35Codeforces Round 901 (Div. 2)108+2301678
    2023-07-27 16:35Educational Codeforces Round 152 (Rated for Div. 2)2290+521448
    2023-06-29 16:35Educational Codeforces Round 151 (Rated for Div. 2)3820+21396
    2023-05-28 17:05Codeforces Round 875 (Div. 2)3726-121394
    2023-04-29 16:50Codeforces Round 869 (Div. 2)2011+81406