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jiazhichen844

Open on Codeforces · Unique solved

Rating2498· 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
35
Unique solved
1,047
Submissions (all)
3,034
Years with activity
2022–2026

Solved by problem rating

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

  • Unrated60
  • 800–89967
  • 900–99923
  • 1000–109915
  • 1100–119924
  • 1200–129919
  • 1300–139930

Solved by topic

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

  • math339
  • greedy338
  • dp332
  • data structures252
  • constructive algorithms246
  • graphs159
  • implementation

Rating changes

2022

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

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)99+912498
2025-09-24 14:50Codeforces Round 1053 (Div. 1)164+542407
2025-09-20 17:35Codeforces Global Round 29 (Div. 1 + Div. 2)536-262353
2025-08-28 17:35Codeforces Round 1046 (Div. 1)219+152379
2025-08-07 17:35Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2)
1400–1499
24
  • 1500–159918
  • 1600–169912
  • 1700–179930
  • 1800–189933
  • 1900–199938
  • 2000–209929
  • 2100–219933
  • 2200–229937
  • 2300–239947
  • 2400–249949
  • 2500–259960
  • 2600–269952
  • 2700–279945
  • 2800–289945
  • 2900–299937
  • 3000–309959
  • 3100–319937
  • 3200–329944
  • 3300–339925
  • 3400–349918
  • 3500–359937
  • 153
  • brute force144
  • combinatorics142
  • trees138
  • dfs and similar131
  • binary search124
  • sortings101
  • number theory99
  • bitmasks93
  • divide and conquer65
  • strings61
  • two pointers60
  • dsu60
  • probabilities50
  • interactive45
  • games35
  • shortest paths33
  • hashing31
  • flows21
  • matrices21
  • fft19
  • string suffix structures18
  • Other (8 tags)55
  • 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.

    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 12/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 22/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 37/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 62/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 35/day in 2026)

    233
    +45
    2364
    2025-07-31 17:35Codeforces Round 1040 (Div. 1)243+352319
    2025-07-19 16:50Order Capital Round 1 (Codeforces Round 1038, Div. 1 + Div. 2)631-162284
    2025-05-17 16:50Codeforces Round 1025 (Div. 2)4+2152300
    2024-12-02 16:35Educational Codeforces Round 172 (Rated for Div. 2)198+252085
    2024-11-30 17:35Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)1093-282060
    2024-10-20 11:05Codeforces Round 980 (Div. 1)675-342088
    2024-07-30 16:35Educational Codeforces Round 168 (Rated for Div. 2)217+382122