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tianbincheng

Open on Codeforces · Unique solved

Rating2318· 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
95
Unique solved
557
Submissions (all)
1,182
Years with activity
2023–2026

Solved by problem rating

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

  • Unrated50
  • 800–899105
  • 900–99917
  • 1000–109919
  • 1100–119936
  • 1200–129931
  • 1300–139930

Solved by topic

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

  • greedy286
  • math230
  • constructive algorithms163
  • implementation145
  • dp122
  • brute force119
  • data structures

Rating changes

2023

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2023

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2026-04-25 17:05Spectral::Cup 2026 Round 1 (Codeforces Round 1094, Div. 1 + Div. 2)478-412318
2026-04-13 16:35Codeforces Round 1093 (Div. 1)313-522359
2026-03-28 17:15Nebius Round 2 (Codeforces Round 1088, Div. 1 + Div. 2)377-302411
2026-03-08 17:35Codeforces Round 1085 (Div. 1 + Div. 2)144+212441
2026-02-23 17:05Codeforces Round 1082 (Div. 1)
1400–1499
23
  • 1500–159926
  • 1600–169929
  • 1700–179935
  • 1800–189924
  • 1900–199925
  • 2000–209927
  • 2100–219917
  • 2200–229915
  • 2300–239916
  • 2400–249913
  • 2500–25998
  • 2600–26997
  • 2800–28991
  • 2900–29991
  • 3300–33992
  • 91
  • binary search76
  • sortings75
  • bitmasks55
  • number theory55
  • combinatorics49
  • graphs48
  • dfs and similar45
  • two pointers42
  • games40
  • strings37
  • trees34
  • interactive22
  • divide and conquer16
  • dsu16
  • shortest paths9
  • ternary search8
  • geometry8
  • probabilities6
  • hashing6
  • graph matchings5
  • *special5
  • Other (9 tags)19
  • 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 4/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
    Nov
    Dec

    LessMore (max 68/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 33/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 25/day in 2026)

    220
    -14
    2420
    2026-02-11 17:35Codeforces Round 1079 (Div. 1)42+1772434
    2026-01-29 17:35Codeforces Round 1077 (Div. 1)102+1372257
    2026-01-17 17:35Codeforces Round 1073 (Div. 1)474+12120
    2026-01-07 17:35Hello 20262139-1112119
    2025-12-27 17:35Good Bye 20251041-532230
    2025-12-19 17:05Codeforces Global Round 31 (Div. 1 + Div. 2)228+762283
    2025-12-06 10:15Codeforces Round 1069 (Div. 1)367-252207