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robertfan

Open on Codeforces · Unique solved

Rating2236· 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
19
Unique solved
182
Submissions (all)
614
Years with activity
2024–2026

Solved by problem rating

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

  • Unrated8
  • 800–89915
  • 900–9994
  • 1000–10991
  • 1100–11995
  • 1200–12998
  • 1300–13995

Solved by topic

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

  • greedy67
  • math65
  • dp61
  • data structures48
  • constructive algorithms48
  • implementation35
  • brute force

Rating changes

2024

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2024

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)347+222236
2026-03-28 17:15Nebius Round 2 (Codeforces Round 1088, Div. 1 + Div. 2)1364-1052214
2026-03-08 17:35Codeforces Round 1085 (Div. 1 + Div. 2)212+232319
2026-02-11 17:35Codeforces Round 1079 (Div. 1)305-122296
2026-01-07 17:35Hello 2026
1400–1499
2
  • 1500–15993
  • 1600–16999
  • 1700–17999
  • 1800–18992
  • 1900–19998
  • 2000–20994
  • 2100–219910
  • 2200–22995
  • 2300–23996
  • 2400–249919
  • 2500–259914
  • 2600–26999
  • 2700–27995
  • 2800–28993
  • 2900–29994
  • 3000–309912
  • 3100–31993
  • 3200–32993
  • 3300–33993
  • 3400–34991
  • 3500–35992
  • 32
  • trees30
  • binary search28
  • combinatorics26
  • sortings25
  • graphs24
  • dfs and similar22
  • interactive20
  • bitmasks19
  • number theory17
  • divide and conquer16
  • two pointers15
  • dsu10
  • strings10
  • games9
  • geometry5
  • shortest paths4
  • probabilities4
  • matrices3
  • ternary search2
  • hashing2
  • communication1
  • Other (6 tags)6
  • 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 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 36/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 22/day in 2026)

    468
    -2
    2308
    2025-12-27 17:35Good Bye 2025932-652310
    2025-12-19 17:05Codeforces Global Round 31 (Div. 1 + Div. 2)146+912375
    2025-12-06 10:15Codeforces Round 1069 (Div. 1)249+22284
    2025-11-23 12:35Codeforces Round 1066 (Div. 1 + Div. 2)1356-1402282
    2025-10-03 17:35Squarepoint Challenge (Codeforces Round 1055, Div. 1 + Div. 2)216+352422
    2025-09-24 14:50Codeforces Round 1053 (Div. 1)108+1132387
    2025-09-20 17:35Codeforces Global Round 29 (Div. 1 + Div. 2)294+662274