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Igorbunov

Open on Codeforces · Unique solved

Rating2400· 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
80
Unique solved
700
Submissions (all)
1,987
Years with activity
2018–2026

Solved by problem rating

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

  • Unrated203
  • 800–89981
  • 900–99924
  • 1000–109930
  • 1100–119920
  • 1200–129923
  • 1300–139925

Solved by topic

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

  • greedy203
  • math190
  • implementation149
  • constructive algorithms130
  • dp90
  • brute force89
  • sortings

Rating changes

2018

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

Jan
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May

Submission volume

Download all years PNG

2018

Download PNG

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

Jan
Feb
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Recent rated rounds

When (UTC)ContestRankΔNew
2021-12-11 12:05Codeforces Round 758 (Div.1 + Div. 2)128+462400
2021-10-30 16:35Codeforces Round 752 (Div. 1)170+722354
2021-09-30 12:15Codeforces Round 745 (Div. 1)403-832282
2021-07-25 17:20Codeforces Global Round 15282+262365
2021-07-22 17:05Harbour.Space Scholarship Contest 2021-2022 (open for everyone, rated, Div. 1 + Div. 2)
1400–1499
35
  • 1500–159939
  • 1600–169929
  • 1700–179932
  • 1800–189927
  • 1900–199925
  • 2000–209915
  • 2100–219922
  • 2200–229916
  • 2300–239920
  • 2400–249915
  • 2500–25993
  • 2600–26994
  • 2700–27993
  • 2800–28993
  • 2900–29993
  • 3100–31991
  • 3200–32992
  • 80
  • data structures57
  • number theory57
  • graphs54
  • binary search48
  • strings43
  • dfs and similar41
  • combinatorics35
  • bitmasks30
  • two pointers29
  • trees27
  • dsu16
  • games15
  • *special15
  • interactive13
  • geometry13
  • shortest paths12
  • hashing11
  • divide and conquer5
  • ternary search5
  • flows5
  • string suffix structures5
  • Other (7 tags)13
  • 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.

    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
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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.

    2022

    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.

    2023

    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.

    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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    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
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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 29/day in 2018)

    2019

    Download PNG

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

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    LessMore (max 96/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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    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).

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    2026

    Download PNG

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

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    LessMore (max 5/day in 2026)

    116
    +104
    2339
    2021-07-17 17:35Codeforces Round 733 (Div. 1 + Div. 2, based on VK Cup 2021 - Elimination (Engine))391+192235
    2021-06-25 17:50Codeforces Round 728 (Div. 1)373-232216
    2021-03-21 15:35Codeforces Round 709 (Div. 1, based on Technocup 2021 Final Round)214+702239
    2021-03-02 16:45Educational Codeforces Round 105 (Rated for Div. 2)10+2302169
    2021-02-28 16:35Codeforces Global Round 133201-1161939
    2021-02-23 11:05Codeforces Round 704 (Div. 2)157+652055
    2021-02-18 16:50Codeforces Round 703 (Div. 2)140+1141990