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IgorI

Open on Codeforces · Unique solved

Rating2516· 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
89
Unique solved
3,052
Submissions (all)
8,444
Years with activity
2016–2026

Solved by problem rating

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

  • Unrated513
  • 800–899402
  • 900–999123
  • 1000–1099142
  • 1100–1199140
  • 1200–1299125
  • 1300–1399136

Solved by topic

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

  • math909
  • implementation872
  • greedy828
  • constructive algorithms526
  • brute force500
  • dp463
  • data structures

Rating changes

2016

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

2016

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2021-03-21 13:20Технокубок 2021 - Финал35-322516
2021-01-28 16:50Codeforces Round 698 (Div. 1)53+1032548
2020-10-25 13:05Technocup 2021 - Elimination Round 124+22445
2020-10-17 15:35Codeforces Raif Round 1 (Div. 1 + Div. 2)437-462443
2020-09-30 17:20Grakn Forces 202068
1400–1499
118
  • 1500–1599142
  • 1600–1699148
  • 1700–1799127
  • 1800–1899139
  • 1900–1999137
  • 2000–2099119
  • 2100–219987
  • 2200–229983
  • 2300–239956
  • 2400–249964
  • 2500–259959
  • 2600–269943
  • 2700–279932
  • 2800–289939
  • 2900–299914
  • 3000–309916
  • 3100–31998
  • 3200–329915
  • 3300–33998
  • 3400–34995
  • 3500–359912
  • 383
  • sortings306
  • binary search284
  • number theory244
  • graphs234
  • dfs and similar222
  • strings208
  • bitmasks170
  • two pointers160
  • trees157
  • combinatorics155
  • dsu79
  • shortest paths74
  • interactive70
  • divide and conquer65
  • geometry64
  • *special57
  • games52
  • hashing49
  • probabilities40
  • matrices21
  • flows21
  • Other (10 tags)99
  • 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.

    2017

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

    Jan
    Feb
    Mar
    Apr
    May
    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.

    2018

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

    Jan
    Feb
    Mar
    Apr
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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
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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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    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
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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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    Jun
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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 50/day in 2016)

    2017

    Download PNG

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

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    LessMore (max 23/day in 2017)

    2018

    Download PNG

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

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    2019

    Download PNG

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

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    2020

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

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    2021

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    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 8/day in 2026)

    +110
    2489
    2020-09-27 17:05Codeforces Round 673 (Div. 1)163+372379
    2020-09-06 16:35Codeforces Round 668 (Div. 1)254+132342
    2020-08-30 16:35Codeforces Round 666 (Div. 1)188+632329
    2020-08-12 16:35Codeforces Round 664 (Div. 1)179+872266
    2020-07-24 16:35Codeforces Round 659 (Div. 1)836-702179
    2020-07-21 16:35Codeforces Round 658 (Div. 1)685-602249
    2020-06-18 17:15Codeforces Global Round 8339+312309