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Top rated · Stats

lajiyuan

Open on Codeforces · Unique solved

Rating2154· 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
52
Unique solved
729
Submissions (all)
1,995
Years with activity
2017–2026

Solved by problem rating

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

  • Unrated147
  • 800–89958
  • 900–99934
  • 1000–109929
  • 1100–119930
  • 1200–129942
  • 1300–139944

Solved by topic

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

  • implementation216
  • math177
  • greedy154
  • brute force111
  • dp97
  • constructive algorithms79
  • sortings

Rating changes

2017

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

2017

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2019-10-08 16:55Educational Codeforces Round 74 (Rated for Div. 2)39+982154
2019-09-19 16:35Educational Codeforces Round 73 (Rated for Div. 2)125+482056
2019-09-18 18:05Codeforces Round 586 (Div. 1 + Div. 2)429+332008
2019-09-15 12:35Codeforces Round 585 (Div. 2)822-621975
2019-09-14 15:35Codeforces Round 584 - Dasha Code Championship - Elimination Round (rated, open for everyone, Div. 1 + Div. 2)
1400–1499
33
  • 1500–159940
  • 1600–169937
  • 1700–179942
  • 1800–189942
  • 1900–199947
  • 2000–209935
  • 2100–219923
  • 2200–229919
  • 2300–239913
  • 2400–24999
  • 2500–25992
  • 2600–26992
  • 2900–29991
  • 66
  • data structures59
  • binary search55
  • geometry52
  • number theory51
  • strings48
  • dfs and similar45
  • graphs45
  • trees33
  • bitmasks26
  • two pointers22
  • combinatorics22
  • dsu17
  • *special15
  • games13
  • divide and conquer11
  • shortest paths9
  • probabilities9
  • interactive8
  • hashing7
  • string suffix structures3
  • flows3
  • Other (6 tags)10
  • 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.

    2018

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

    Jan
    Feb
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    Apr
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    Jun
    Jul
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    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.

    2019

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

    Jan
    Feb
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    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
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    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
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    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
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    Jun
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    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
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    Jun
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    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
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    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
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    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
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    Apr
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    Jun
    Jul
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    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.

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    LessMore (max 21/day in 2017)

    2018

    Download PNG

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

    Jan
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    LessMore (max 31/day in 2018)

    2019

    Download PNG

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

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    2020

    Download PNG

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

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    2021

    Download PNG

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

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    2022

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

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    2023

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

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    2024

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

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    2025

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

    Jan
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    LessMore (max 6/day in 2025)

    2026

    Download PNG

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

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    LessMore (max 1/day in 2026)

    669
    +8
    2037
    2019-09-05 16:35Educational Codeforces Round 72 (Rated for Div. 2)821-482029
    2019-06-11 15:05Codeforces Round 566 (Div. 2)139+352077
    2019-03-05 17:20Educational Codeforces Round 61 (Rated for Div. 2)80+722042
    2019-02-10 16:05Codeforces Round 538 (Div. 2)664-321970
    2019-01-04 17:45Hello 2019503+532002
    2018-12-30 17:15Good Bye 2018888+251949
    2018-11-24 09:50Codeforces Round 524 (Div. 2)148+601924