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Madball

Open on Codeforces · Unique solved

Rating2444· 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
55
Unique solved
1,474
Submissions (all)
3,365
Years with activity
2014–2026

Solved by problem rating

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

  • Unrated1,132
  • 800–89917
  • 900–9998
  • 1000–10996
  • 1100–119910
  • 1200–129913
  • 1300–139918

Solved by topic

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

  • greedy116
  • implementation116
  • math97
  • constructive algorithms92
  • dp72
  • brute force56
  • *special

Rating changes

2014

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2014

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2022-06-16 16:35Codeforces Round 800 (Div. 1)169+212444
2021-05-24 16:50Codeforces Round 722 (Div. 1)105+892423
2021-04-23 17:20Contest 2050 and Codeforces Round 718 (Div. 1 + Div. 2)412-12334
2021-04-16 16:50Codeforces Round 715 (Div. 1)786-1342335
2021-04-03 16:50Codeforces Round 712 (Div. 1)78
1400–1499
23
  • 1500–159922
  • 1600–169924
  • 1700–179929
  • 1800–189933
  • 1900–199930
  • 2000–209918
  • 2100–219920
  • 2200–229922
  • 2300–239913
  • 2400–249911
  • 2500–259910
  • 2600–26995
  • 2700–27992
  • 2800–28993
  • 2900–29991
  • 3000–30992
  • 3100–31991
  • 3400–34991
  • 48
  • data structures42
  • dfs and similar41
  • binary search40
  • graphs39
  • sortings39
  • number theory32
  • trees27
  • combinatorics25
  • strings22
  • two pointers18
  • dsu17
  • bitmasks16
  • interactive14
  • games12
  • geometry12
  • shortest paths12
  • hashing10
  • string suffix structures7
  • probabilities7
  • ternary search3
  • divide and conquer3
  • Other (7 tags)11
  • 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.

    2015

    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.

    2016

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    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.

    2017

    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.

    2018

    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.

    2019

    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.

    2020

    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.

    2021

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

    Jan
    Feb
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    Jun
    Jul
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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
    Mar
    Apr
    May
    Jun
    Jul
    Aug
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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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    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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    Jun
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    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.

    2025

    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
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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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    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.

    May
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    LessMore (max 14/day in 2014)

    2015

    Download PNG

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

    Jan
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    LessMore (max 13/day in 2015)

    2016

    Download PNG

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

    Jan
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    LessMore (max 20/day in 2016)

    2017

    Download PNG

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

    Jan
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    LessMore (max 28/day in 2017)

    2018

    Download PNG

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

    Jan
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    LessMore (max 27/day in 2018)

    2019

    Download PNG

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

    Jan
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    LessMore (max 17/day in 2019)

    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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    LessMore (max 27/day in 2021)

    2022

    Download PNG

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

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    LessMore (max 279/day in 2022)

    2023

    Download PNG

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

    Jan
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    LessMore (max 25/day in 2023)

    2024

    Download PNG

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

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    Jun
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    LessMore (max 22/day in 2024)

    2025

    Download PNG

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

    Jan
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    Mar
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    May
    Jun
    Jul
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    LessMore (max 24/day in 2025)

    2026

    Download PNG

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

    Jan
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    LessMore (max 18/day in 2026)

    +102
    2469
    2021-03-21 15:35Codeforces Round 709 (Div. 1, based on Technocup 2021 Final Round)297-192367
    2021-03-10 14:05Codeforces Round 706 (Div. 1)338-192386
    2021-02-28 16:35Codeforces Global Round 131004-1042405
    2019-11-19 16:35Codeforces Round 601 (Div. 1)74+332509
    2019-11-06 17:05Codeforces Round 599 (Div. 1)326-932476
    2019-02-24 17:35Codeforces Round 542 [Alex Lopashev Thanks-Round] (Div. 1)85-512569
    2019-02-16 19:05Codeforces Round 539 (Div. 1)39+92620