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Top rated · Stats

Ji_Kuai

Open on Codeforces · Unique solved

Rating2178· 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
95
Unique solved
1,960
Submissions (all)
4,136
Years with activity
2019–2025

Solved by problem rating

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

  • Unrated288
  • 800–899262
  • 900–999101
  • 1000–1099108
  • 1100–119968
  • 1200–129991
  • 1300–139998

Solved by topic

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

  • greedy647
  • math626
  • implementation521
  • dp352
  • constructive algorithms340
  • brute force320
  • data structures

Rating changes

2019

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2019

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2022-01-03 16:50Hello 2022622+72178
2021-03-02 16:45Educational Codeforces Round 105 (Rated for Div. 2)57+982171
2021-02-28 16:35Codeforces Global Round 131688-682073
2021-01-19 16:35Codeforces Round 696 (Div. 2)26+1592141
2021-01-05 16:35Codeforces Round 694 (Div. 1)805
1400–1499
82
  • 1500–1599105
  • 1600–169994
  • 1700–1799112
  • 1800–189996
  • 1900–199993
  • 2000–209978
  • 2100–219989
  • 2200–229960
  • 2300–239936
  • 2400–249936
  • 2500–259923
  • 2600–26998
  • 2700–279913
  • 2800–28999
  • 2900–29992
  • 3000–30994
  • 3100–31992
  • 3200–32991
  • 3300–33991
  • 267
  • sortings226
  • binary search193
  • dfs and similar150
  • strings141
  • graphs138
  • number theory129
  • two pointers121
  • trees105
  • combinatorics97
  • bitmasks92
  • *special65
  • dsu62
  • divide and conquer44
  • geometry41
  • shortest paths37
  • games27
  • hashing26
  • interactive23
  • ternary search17
  • probabilities16
  • flows11
  • Other (9 tags)47
  • 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.

    2020

    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.

    2021

    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.

    2022

    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.

    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
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    Dec

    LessMore (max 31/day in 2019)

    2020

    Download PNG

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

    Jan
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    LessMore (max 28/day in 2020)

    2021

    Download PNG

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

    Jan
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    Jun
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    LessMore (max 47/day in 2021)

    2022

    Download PNG

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

    Jan
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    LessMore (max 28/day in 2022)

    2023

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
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    Sep
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    LessMore (max 32/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 20/day in 2024)

    2025

    Download PNG

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

    Jan
    Feb
    Mar
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    May
    Jun
    Jul
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    Dec

    LessMore (max 3/day in 2025)

    -50
    1982
    2020-12-30 17:35Good Bye 2020727+642032
    2020-12-28 16:35Educational Codeforces Round 101 (Rated for Div. 2)841-261968
    2020-12-20 17:05Codeforces Round 692 (Div. 1, based on Technocup 2021 Elimination Round 3)772-1021994
    2020-12-17 16:35Educational Codeforces Round 100 (Rated for Div. 2)17+2302096
    2020-12-11 16:35Codeforces Round 689 (Div. 2, based on Zed Code Competition)1631-741866
    2020-12-06 17:35Codeforces Global Round 121280-151940
    2020-12-04 15:20Codeforces Round 688 (Div. 2)139+1021955