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buidangnguyen05

Open on Codeforces · Unique solved

Rating2163· 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
86
Unique solved
583
Submissions (all)
1,424
Years with activity
2020–2024

Solved by problem rating

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

  • Unrated20
  • 800–89995
  • 900–99929
  • 1000–109919
  • 1100–119939
  • 1200–129924
  • 1300–139928

Solved by topic

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

  • greedy242
  • math221
  • constructive algorithms145
  • implementation144
  • dp139
  • brute force112
  • data structures

Rating changes

2020

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2020

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2024-10-14 16:35Educational Codeforces Round 170 (Rated for Div. 2)67+862163
2024-09-29 17:35Codeforces Round 976 (Div. 2) and Divide By Zero 9.080+1102077
2024-09-14 16:35Codeforces Round 972 (Div. 2)1844-791967
2024-08-30 17:05Codeforces Round 969 (Div. 1)427+752046
2024-06-09 17:35Codeforces Global Round 26
1400–1499
24
  • 1500–159920
  • 1600–169925
  • 1700–179929
  • 1800–189940
  • 1900–199936
  • 2000–209939
  • 2100–219933
  • 2200–229926
  • 2300–239915
  • 2400–249915
  • 2500–259910
  • 2600–26995
  • 2700–27994
  • 2800–28995
  • 2900–29991
  • 3000–30991
  • 3200–32991
  • 110
  • sortings85
  • binary search70
  • dfs and similar57
  • trees54
  • graphs53
  • number theory53
  • bitmasks50
  • strings50
  • two pointers42
  • combinatorics31
  • dsu31
  • divide and conquer21
  • shortest paths17
  • geometry14
  • interactive12
  • hashing11
  • games11
  • graph matchings8
  • *special8
  • flows6
  • probabilities5
  • Other (7 tags)20
  • 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.

    2021

    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.

    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.

    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    LessMore (max 10/day in 2020)

    2021

    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 25/day in 2021)

    2022

    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 44/day in 2022)

    2023

    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 27/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 16/day in 2024)

    3067
    -130
    1971
    2024-04-06 17:35Codeforces Global Round 25756+102101
    2024-03-30 17:35CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)1660-842091
    2024-01-06 17:05Hello 2024428+712175
    2023-12-30 16:50Good Bye 20231201-162104
    2023-01-21 16:35Codeforces Round 845 (Div. 2) and ByteRace 202354+862120
    2023-01-15 15:05Codeforces Round 844 (Div. 1 + Div. 2, based on VK Cup 2022 - Elimination Round)544+492034
    2023-01-08 16:35Educational Codeforces Round 141 (Rated for Div. 2)694-311985