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diandian2020

Open on Codeforces · Unique solved

Rating2669· International 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
16
Unique solved
609
Submissions (all)
1,340
Years with activity
2022–2026

Solved by problem rating

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

  • Unrated10
  • 800–89940
  • 900–9996
  • 1000–10994
  • 1100–11998
  • 1200–129917
  • 1300–139912

Solved by topic

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

  • dp242
  • math215
  • greedy172
  • data structures164
  • combinatorics110
  • implementation95
  • constructive algorithms

Rating changes

2022

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

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May

Submission volume

Download all years PNG

2022

Download PNG

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

Jan
Feb
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Recent rated rounds

When (UTC)ContestRankΔNew
2026-01-17 17:35Codeforces Round 1073 (Div. 1)179-562669
2025-12-27 17:35Good Bye 202548+932725
2025-12-06 10:15Codeforces Round 1069 (Div. 1)50+472632
2025-11-23 12:35Codeforces Round 1066 (Div. 1 + Div. 2)54+1042585
2025-05-11 17:05Codeforces Round 1024 (Div. 1)127
1400–1499
18
  • 1500–159911
  • 1600–169913
  • 1700–179910
  • 1800–189914
  • 1900–199920
  • 2000–209916
  • 2100–219915
  • 2200–229923
  • 2300–239922
  • 2400–249934
  • 2500–259930
  • 2600–269927
  • 2700–279930
  • 2800–289932
  • 2900–299974
  • 3000–309925
  • 3100–319932
  • 3200–329915
  • 3300–339917
  • 3400–34998
  • 3500–359926
  • 92
  • brute force88
  • trees79
  • graphs74
  • bitmasks74
  • binary search67
  • number theory67
  • dfs and similar58
  • sortings54
  • two pointers43
  • divide and conquer41
  • probabilities40
  • strings37
  • dsu24
  • shortest paths21
  • geometry19
  • games17
  • hashing15
  • flows14
  • interactive13
  • matrices12
  • fft11
  • Other (8 tags)30
  • 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.

    2023

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

    Jan
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    Apr
    May
    Jun
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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.

    2024

    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.

    2025

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

    Jan
    Feb
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    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.

    2026

    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.

    May
    Jun
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    Aug
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    Dec

    LessMore (max 17/day in 2022)

    2023

    Download PNG

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

    Jan
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    LessMore (max 19/day in 2023)

    2024

    Download PNG

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

    Jan
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    May
    Jun
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    LessMore (max 28/day in 2024)

    2025

    Download PNG

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

    Jan
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    May
    Jun
    Jul
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    Dec

    LessMore (max 23/day in 2025)

    2026

    Download PNG

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

    Jan
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    May
    Jun
    Jul
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    Dec

    LessMore (max 34/day in 2026)

    +40
    2481
    2025-04-26 11:35Codeforces Round 1021 (Div. 1)108+482441
    2025-04-05 17:35Teza Round 1 (Codeforces Round 1015, Div. 1 + Div. 2)499-472393
    2024-12-28 17:35Good Bye 2024: 2025 is NEAR389-102440
    2024-11-23 17:35CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)218+302450
    2024-09-27 16:05Codeforces Round 975 (Div. 1)179+422420
    2024-07-18 16:35Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2)207+942378
    2024-07-07 16:50Codeforces Round 956 (Div. 2) and ByteRace 202417+2192284