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Top rated · Stats

yangchang

Open on Codeforces · Unique solved

Rating2613· 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
20
Unique solved
521
Submissions (all)
1,820
Years with activity
2021–2026

Solved by problem rating

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

  • Unrated51
  • 800–89924
  • 900–9994
  • 1000–10998
  • 1100–11995
  • 1200–12999
  • 1300–13997

Solved by topic

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

  • dp184
  • math162
  • greedy149
  • data structures134
  • constructive algorithms100
  • brute force76
  • graphs

Rating changes

2021

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

2021

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2026-04-25 17:05Spectral::Cup 2026 Round 1 (Codeforces Round 1094, Div. 1 + Div. 2)70+552613
2026-04-13 16:35Codeforces Round 1093 (Div. 1)38+1232558
2026-03-28 17:15Nebius Round 2 (Codeforces Round 1088, Div. 1 + Div. 2)149+482435
2026-03-08 17:35Codeforces Round 1085 (Div. 1 + Div. 2)176+202387
2026-02-23 17:05Codeforces Round 1082 (Div. 1)
1400–1499
7
  • 1500–15995
  • 1600–16995
  • 1700–179913
  • 1800–18996
  • 1900–199921
  • 2000–209916
  • 2100–219914
  • 2200–229925
  • 2300–239939
  • 2400–249948
  • 2500–259925
  • 2600–269932
  • 2700–279918
  • 2800–289920
  • 2900–299923
  • 3000–309920
  • 3100–319917
  • 3200–329923
  • 3300–339918
  • 3400–34997
  • 3500–359911
  • 75
  • implementation74
  • combinatorics67
  • dfs and similar63
  • trees61
  • binary search60
  • bitmasks56
  • sortings49
  • number theory39
  • divide and conquer38
  • dsu32
  • strings30
  • interactive29
  • probabilities26
  • two pointers22
  • games19
  • hashing16
  • shortest paths16
  • geometry13
  • string suffix structures13
  • matrices13
  • fft11
  • Other (7 tags)33
  • 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.

    2022

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

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

    May
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    LessMore (max 5/day in 2021)

    2022

    Download PNG

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

    Jan
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    LessMore (max 22/day in 2022)

    2023

    Download PNG

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

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    LessMore (max 28/day in 2023)

    2024

    Download PNG

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

    Jan
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    Jun
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    LessMore (max 28/day in 2024)

    2025

    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 28/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 20/day in 2026)

    117
    +79
    2367
    2026-02-11 17:35Codeforces Round 1079 (Div. 1)281+12288
    2026-01-17 17:35Codeforces Round 1073 (Div. 1)234+442287
    2026-01-07 17:35Hello 20261043-692243
    2025-12-27 17:35Good Bye 2025202+952312
    2025-12-19 17:05Codeforces Global Round 31 (Div. 1 + Div. 2)939-562217
    2024-08-11 17:35EPIC Institute of Technology Round August 2024 (Div. 1 + Div. 2)183+1172273
    2024-04-29 16:35Educational Codeforces Round 165 (Rated for Div. 2)29+1492156