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Top rated · Stats

lichangrong

Open on Codeforces · Unique solved

Rating2179· 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
33
Unique solved
526
Submissions (all)
1,742
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.

  • Unrated109
  • 800–899107
  • 900–99917
  • 1000–109919
  • 1100–119919
  • 1200–129928
  • 1300–139919

Solved by topic

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

  • greedy208
  • math177
  • constructive algorithms115
  • implementation110
  • dp90
  • data structures85
  • brute force

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
2022-10-23 12:05Codeforces Round 830 (Div. 2)30+1142179
2022-10-23 09:50Codeforces Round 829 (Div. 2)8+2202065
2022-09-23 14:05Codeforces Round 822 (Div. 2)181+1211845
2022-07-18 16:35Codeforces Round 809 (Div. 2)8154-1741724
2022-02-23 12:10Codeforces Round 773 (Div. 1)705
1400–1499
20
  • 1500–159914
  • 1600–169918
  • 1700–179926
  • 1800–189920
  • 1900–199916
  • 2000–209923
  • 2100–219911
  • 2200–229914
  • 2300–239912
  • 2400–249916
  • 2500–25999
  • 2600–26994
  • 2700–27993
  • 2800–28992
  • 83
  • sortings62
  • binary search55
  • number theory50
  • bitmasks45
  • two pointers43
  • dfs and similar34
  • combinatorics32
  • graphs32
  • strings31
  • trees19
  • shortest paths14
  • geometry13
  • dsu13
  • games10
  • hashing8
  • divide and conquer7
  • interactive6
  • matrices4
  • flows3
  • graph matchings3
  • probabilities2
  • Other (3 tags)6
  • Jun
    Jul
    Aug
    Sep
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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
    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
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    Aug
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    Dec

    LessMore (max 22/day in 2021)

    2022

    Download PNG

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

    Jan
    Feb
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    Jun
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    LessMore (max 67/day in 2022)

    2023

    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 18/day in 2023)

    2024

    Download PNG

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

    Jan
    Feb
    Mar
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    May
    Jun
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    Dec

    LessMore (max 11/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 23/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 18/day in 2026)

    -11
    1898
    2022-02-22 16:35Educational Codeforces Round 123 (Rated for Div. 2)542+41909
    2022-01-03 16:50Hello 20221239+141905
    2021-12-28 15:35Codeforces Round 763 (Div. 2)394+331891
    2021-12-24 17:05Codeforces Global Round 181118+251858
    2021-12-01 16:35Educational Codeforces Round 118 (Rated for Div. 2)385+661833
    2021-11-26 13:15Codeforces Round 757 (Div. 2)312+1031767
    2021-11-22 11:35Educational Codeforces Round 117 (Rated for Div. 2)1419-391664