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Top rated · Stats

Duck_sajin

Open on Codeforces · Unique solved

Rating2436· Grandmaster

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
48
Unique solved
3,437
Submissions (all)
6,460
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.

  • Unrated392
  • 800–899618
  • 900–999150
  • 1000–1099171
  • 1100–1199173
  • 1200–1299162
  • 1300–1399165

Solved by topic

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

  • greedy1,275
  • math1,158
  • implementation947
  • constructive algorithms651
  • brute force642
  • dp577
  • data structures

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
2024-07-28 17:35Pinely Round 4 (Div. 1 + Div. 2)66+1602436
2024-06-09 17:35Codeforces Global Round 26323+462276
2024-05-25 17:35Codeforces Round 947 (Div. 1 + Div. 2)427+72230
2023-08-31 16:35Educational Codeforces Round 154 (Rated for Div. 2)26+1242223
2023-08-30 17:35Pinely Round 2 (Div. 1 + Div. 2)
1400–1499
161
  • 1500–1599161
  • 1600–1699156
  • 1700–1799176
  • 1800–1899146
  • 1900–1999177
  • 2000–2099127
  • 2100–2199106
  • 2200–2299116
  • 2300–239981
  • 2400–249972
  • 2500–259937
  • 2600–269938
  • 2700–279921
  • 2800–289914
  • 2900–29996
  • 3000–30997
  • 3100–31991
  • 3200–32991
  • 3300–33991
  • 3500–35991
  • 512
  • sortings440
  • binary search393
  • strings283
  • number theory276
  • dfs and similar271
  • graphs257
  • two pointers228
  • bitmasks201
  • trees186
  • combinatorics180
  • dsu117
  • games91
  • divide and conquer81
  • shortest paths72
  • geometry61
  • interactive61
  • hashing57
  • probabilities32
  • flows23
  • ternary search20
  • matrices20
  • Other (9 tags)75
  • 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
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    Apr
    May
    Jun
    Jul
    Aug
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    Oct
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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.

    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 29/day in 2021)

    2022

    Download PNG

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

    Jan
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    LessMore (max 53/day in 2022)

    2023

    Download PNG

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

    Jan
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    May
    Jun
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    LessMore (max 49/day in 2023)

    2024

    Download PNG

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

    Jan
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    May
    Jun
    Jul
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    Dec

    LessMore (max 44/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 25/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 24/day in 2026)

    1953
    -112
    2099
    2023-08-26 17:35Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2)181+1162211
    2023-07-16 16:35Codeforces Round 885 (Div. 2)122+602095
    2023-07-11 17:35Codeforces Round 884 (Div. 1 + Div. 2)692+272035
    2023-07-06 16:50Codeforces Round 882 (Div. 2)414+22008
    2023-06-29 16:35Educational Codeforces Round 151 (Rated for Div. 2)473-82006
    2023-06-24 17:05CodeTON Round 5 (Div. 1 + Div. 2, Rated, Prizes!)1452-642014
    2023-06-18 16:35Codeforces Round 880 (Div. 1)584-442078