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erduolong

Open on Codeforces · Unique solved

Rating2361· International 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
18
Unique solved
324
Submissions (all)
824
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.

  • Unrated1
  • 800–89918
  • 900–9992
  • 1000–10999
  • 1100–11995
  • 1200–12995
  • 1300–13997

Solved by topic

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

  • dp113
  • data structures103
  • math96
  • greedy94
  • trees64
  • constructive algorithms60
  • combinatorics

Rating changes

2022

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

Jan
Feb
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Apr
May

Submission volume

Download all years PNG

2022

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2024-06-30 17:35EPIC Institute of Technology Round Summer 2024 (Div. 1 + Div. 2)152+782361
2024-06-09 17:35Codeforces Global Round 26364+302283
2024-04-27 16:35Codeforces Round 941 (Div. 1)409+52253
2024-03-16 17:00Codeforces Round 934 (Div. 1)476-212248
2024-02-23 16:35Educational Codeforces Round 162 (Rated for Div. 2)
1400–1499
7
  • 1500–15994
  • 1600–16994
  • 1700–179911
  • 1800–189917
  • 1900–19998
  • 2000–209919
  • 2100–219912
  • 2200–229916
  • 2300–239917
  • 2400–249938
  • 2500–259922
  • 2600–269916
  • 2700–279914
  • 2800–289914
  • 2900–299911
  • 3000–309916
  • 3100–319913
  • 3200–32998
  • 3300–33998
  • 3400–34992
  • 46
  • dfs and similar44
  • brute force43
  • graphs41
  • implementation40
  • strings34
  • binary search33
  • bitmasks31
  • number theory29
  • sortings28
  • divide and conquer23
  • dsu21
  • probabilities19
  • string suffix structures18
  • interactive16
  • two pointers15
  • games15
  • hashing15
  • shortest paths14
  • matrices6
  • fft5
  • graph matchings4
  • Other (5 tags)9
  • 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.

    2023

    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.

    2024

    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.

    2025

    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.

    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
    Sep
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    Nov
    Dec

    LessMore (max 7/day in 2022)

    2023

    Download PNG

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

    Jan
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    LessMore (max 48/day in 2023)

    2024

    Download PNG

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

    Jan
    Feb
    Mar
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    May
    Jun
    Jul
    Aug
    Sep
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    LessMore (max 20/day in 2024)

    2025

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
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    Dec

    LessMore (max 2/day in 2025)

    2026

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    LessMore (max 1/day in 2026)

    5
    +207
    2269
    2024-02-17 17:35think-cell Round 12393-1342062
    2023-12-30 16:50Good Bye 2023711+112196
    2023-12-23 17:35Pinely Round 3 (Div. 1 + Div. 2)428+382185
    2023-11-25 17:20CodeTON Round 7 (Div. 1 + Div. 2, Rated, Prizes!)430+432147
    2023-10-08 11:35Codeforces Round 902 (Div. 1, based on COMPFEST 15 - Final Round)685-462104
    2023-09-24 16:35Educational Codeforces Round 155 (Rated for Div. 2)41+1252150
    2023-09-18 16:50CodeTON Round 6 (Div. 1 + Div. 2, Rated, Prizes!)796+292025