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Top rated · Stats

chenrui9551

Open on Codeforces · Unique solved

Rating2222· 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
61
Unique solved
352
Submissions (all)
827
Years with activity
2012–2026

Solved by problem rating

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

  • Unrated5
  • 800–89943
  • 900–99915
  • 1000–109922
  • 1100–119911
  • 1200–129923
  • 1300–139918

Solved by topic

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

  • greedy140
  • math126
  • implementation99
  • dp78
  • constructive algorithms74
  • brute force65
  • data structures

Rating changes

2012

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2012

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2025-09-24 14:50Codeforces Round 1053 (Div. 1)566-472222
2025-08-26 16:35Codeforces Round 1045 (Div. 2)8+1912269
2025-07-06 17:35EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2)1826-1042078
2025-05-31 16:35Codeforces Round 1028 (Div. 1)351+362182
2025-04-19 16:35Neowise Labs Contest 1 (Codeforces Round 1018, Div. 1 + Div. 2)
1400–1499
22
  • 1500–159918
  • 1600–169919
  • 1700–179921
  • 1800–189918
  • 1900–199918
  • 2000–209923
  • 2100–219916
  • 2200–22998
  • 2300–239915
  • 2400–249911
  • 2500–25998
  • 2600–26998
  • 2700–27992
  • 2800–28993
  • 2900–29992
  • 3000–30992
  • 3100–31991
  • 60
  • binary search44
  • sortings43
  • dfs and similar37
  • number theory33
  • combinatorics28
  • trees25
  • graphs25
  • strings24
  • bitmasks23
  • two pointers16
  • games16
  • dsu14
  • hashing12
  • geometry12
  • divide and conquer12
  • probabilities9
  • shortest paths8
  • interactive7
  • ternary search3
  • *special2
  • matrices2
  • Other (7 tags)10
  • 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.

    2013

    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.

    2014

    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.

    2015

    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.

    2016

    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.

    2019

    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.

    2020

    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.

    2021

    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.

    2022

    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.

    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
    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.

    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
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    LessMore (max 14/day in 2012)

    2013

    Download PNG

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

    Jan
    Feb
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    May
    Jun
    Jul
    Aug
    Sep
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    LessMore (max 6/day in 2013)

    2014

    Download PNG

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

    Jan
    Feb
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    May
    Jun
    Jul
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    LessMore (max 20/day in 2014)

    2015

    Download PNG

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

    Jan
    Feb
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    May
    Jun
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    LessMore (max 9/day in 2015)

    2016

    Download PNG

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

    Jan
    Feb
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    May
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    LessMore (max 7/day in 2016)

    2019

    Download PNG

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

    Jan
    Feb
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    May
    Jun
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    Sep
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    LessMore (max 9/day in 2019)

    2020

    Download PNG

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

    Jan
    Feb
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    LessMore (max 5/day in 2020)

    2021

    Download PNG

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

    Jan
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    LessMore (max 16/day in 2021)

    2022

    Download PNG

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

    Jan
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    LessMore (max 12/day in 2022)

    2023

    Download PNG

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

    Jan
    Feb
    Mar
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    May
    Jun
    Jul
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    LessMore (max 1/day in 2023)

    2024

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
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    Dec

    LessMore (max 21/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 8/day in 2025)

    2026

    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 2026)

    827
    -13
    2146
    2025-03-23 08:05Codeforces Round 1012 (Div. 1)410-392159
    2025-03-10 17:15Codeforces Round 1008 (Div. 1)524-422198
    2025-02-11 16:35Codeforces Round 1004 (Div. 1)762-932240
    2025-01-26 17:05Ethflow Round 1 (Codeforces Round 1001, Div. 1 + Div. 2)408+212333
    2025-01-20 17:35IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2)288+362312
    2025-01-04 17:05Hello 2025600-42276
    2024-12-28 17:35Good Bye 2024: 2025 is NEAR324+662280