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lichenghan

Open on Codeforces · Unique solved

Rating2348· 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
26
Unique solved
627
Submissions (all)
1,690
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.

  • Unrated9
  • 800–89967
  • 900–99912
  • 1000–109917
  • 1100–119918
  • 1200–129921
  • 1300–139932

Solved by topic

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

  • greedy208
  • math206
  • dp179
  • data structures141
  • constructive algorithms130
  • implementation125

Rating changes

2021

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2021

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)154+852348
2024-12-19 17:35Codeforces Global Round 281174-972263
2023-10-22 13:05Codeforces Round 905 (Div. 1)146+742360
2023-06-18 16:35Codeforces Round 880 (Div. 1)256+272286
2023-05-28 17:05Codeforces Round 875 (Div. 1)270
1400–1499
23
  • 1500–159920
  • 1600–169920
  • 1700–179933
  • 1800–189921
  • 1900–199935
  • 2000–209926
  • 2100–219921
  • 2200–229923
  • 2300–239932
  • 2400–249928
  • 2500–259928
  • 2600–269915
  • 2700–279922
  • 2800–289926
  • 2900–299915
  • 3000–309926
  • 3100–319913
  • 3200–329913
  • 3300–33996
  • 3400–34994
  • 3500–35991
  • brute force
    96
  • trees90
  • binary search83
  • graphs75
  • dfs and similar75
  • combinatorics75
  • sortings69
  • strings59
  • number theory57
  • bitmasks48
  • two pointers45
  • divide and conquer33
  • probabilities31
  • interactive28
  • dsu27
  • hashing22
  • matrices15
  • games14
  • shortest paths13
  • flows12
  • string suffix structures12
  • geometry11
  • Other (9 tags)35
  • 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 8/day in 2021)

    2022

    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 82/day in 2022)

    2023

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
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    LessMore (max 41/day in 2023)

    2024

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    Oct
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    Dec

    LessMore (max 15/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 18/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 13/day in 2026)

    +13
    2259
    2023-05-08 14:05Codeforces Round 872 (Div. 1)207+632246
    2023-03-09 12:35Codeforces Round 857 (Div. 1)423-232183
    2022-12-30 17:05Good Bye 2022: 2023 is NEAR152+1782206
    2022-12-17 17:05Polynomial Round 2022 (Div. 1 + Div. 2, Rated, Prizes!)2434-1432028
    2022-12-15 17:05Codeforces Round 838 (Div. 2)33+1132171
    2022-12-11 17:35Codeforces Round 837 (Div. 2)143+552058
    2022-10-17 16:35Educational Codeforces Round 137 (Rated for Div. 2)123+862003