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Top rated · Stats

collares

Open on Codeforces · Unique solved

Rating2215· 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
75
Unique solved
484
Submissions (all)
1,208
Years with activity
2010–2025

Solved by problem rating

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

  • Unrated46
  • 800–89958
  • 900–99920
  • 1000–109919
  • 1100–119912
  • 1200–129921
  • 1300–139925

Solved by topic

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

  • greedy171
  • math148
  • implementation137
  • constructive algorithms127
  • brute force96
  • dp89
  • data structures

Rating changes

2010

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2010

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2025-12-27 17:35Good Bye 20251178-622215
2025-09-20 17:35Codeforces Global Round 29 (Div. 1 + Div. 2)342+482277
2025-01-26 17:05Ethflow Round 1 (Codeforces Round 1001, Div. 1 + Div. 2)559+212229
2024-03-16 17:00Codeforces Round 934 (Div. 1)346+382208
2024-02-29 16:35Codeforces Round 930 (Div. 1)
1400–1499
31
  • 1500–159919
  • 1600–169930
  • 1700–179927
  • 1800–189924
  • 1900–199924
  • 2000–209927
  • 2100–219918
  • 2200–229920
  • 2300–239914
  • 2400–249919
  • 2500–259913
  • 2600–26998
  • 2700–27993
  • 2800–28991
  • 2900–29993
  • 3000–30991
  • 3200–32991
  • 70
  • sortings57
  • number theory46
  • graphs42
  • dfs and similar41
  • binary search40
  • combinatorics34
  • strings33
  • bitmasks33
  • two pointers30
  • trees27
  • *special24
  • dsu18
  • interactive16
  • shortest paths14
  • games11
  • geometry11
  • divide and conquer10
  • hashing8
  • probabilities5
  • matrices5
  • meet-in-the-middle3
  • Other (6 tags)12
  • 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.

    2011

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
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    Oct
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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.

    2013

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

    Jan
    Feb
    Mar
    Apr
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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.

    2014

    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.

    2016

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

    Jan
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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.

    2017

    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.

    2018

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

    Jan
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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
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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.

    2020

    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.

    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
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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
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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
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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
    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.

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    LessMore (max 18/day in 2010)

    2011

    Download PNG

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

    Jan
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    LessMore (max 12/day in 2011)

    2013

    Download PNG

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

    Jan
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    LessMore (max 3/day in 2013)

    2014

    Download PNG

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

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    LessMore (max 4/day in 2014)

    2016

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

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    LessMore (max 5/day in 2016)

    2017

    Download PNG

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

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    LessMore (max 34/day in 2017)

    2018

    Download PNG

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

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    LessMore (max 65/day in 2018)

    2019

    Download PNG

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

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    LessMore (max 1/day in 2019)

    2020

    Download PNG

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

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    LessMore (max 20/day in 2020)

    2021

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

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    LessMore (max 12/day in 2021)

    2022

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

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    LessMore (max 20/day in 2022)

    2023

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

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    LessMore (max 17/day in 2023)

    2024

    Download PNG

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

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    LessMore (max 8/day in 2024)

    2025

    Download PNG

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

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    LessMore (max 11/day in 2025)

    231
    +75
    2170
    2024-01-27 16:45Codeforces Round 921 (Div. 1)632-362095
    2023-09-24 16:35Educational Codeforces Round 155 (Rated for Div. 2)34+1502131
    2023-08-17 16:35Educational Codeforces Round 153 (Rated for Div. 2)1317-621981
    2023-08-15 16:35Codeforces Round 893 (Div. 2)227+422043
    2023-08-12 16:35Codeforces Round 892 (Div. 2)1743-922001
    2023-02-09 16:35Codeforces Round 851 (Div. 2)192+222093
    2023-01-29 17:35TypeDB Forces 2023 (Div. 1 + Div. 2, Rated, Prizes!)1657-1022071