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Top rated · Stats

xuanquang1999

Open on Codeforces · Unique solved

Rating2446· 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
96
Unique solved
1,824
Submissions (all)
3,974
Years with activity
2014–2024

Solved by problem rating

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

  • Unrated307
  • 800–89999
  • 900–99958
  • 1000–109964
  • 1100–119982
  • 1200–129983
  • 1300–139984

Solved by topic

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

  • implementation532
  • math406
  • greedy377
  • dp280
  • brute force268
  • data structures228
  • constructive algorithms

Rating changes

2014

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2014

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2020-03-19 17:05Codeforces Global Round 7172+442446
2019-11-19 16:35Codeforces Round 601 (Div. 1)68+832402
2019-11-06 17:05Codeforces Round 599 (Div. 1)341-522319
2019-09-04 11:35Codeforces Round 583 (Div. 1 + Div. 2, based on Olympiad of Metropolises)226-332371
2018-10-04 09:35Codeforces Round 513 by Barcelona Bootcamp (rated, Div. 1 + Div. 2)
1400–1499
71
  • 1500–1599103
  • 1600–1699125
  • 1700–1799107
  • 1800–189990
  • 1900–199993
  • 2000–2099105
  • 2100–219998
  • 2200–229969
  • 2300–239950
  • 2400–249954
  • 2500–259936
  • 2600–269920
  • 2700–279915
  • 2800–28997
  • 2900–29993
  • 3000–30991
  • 217
  • sortings164
  • binary search163
  • dfs and similar152
  • graphs144
  • number theory136
  • strings123
  • trees107
  • geometry107
  • two pointers83
  • combinatorics83
  • bitmasks60
  • dsu46
  • shortest paths44
  • hashing31
  • probabilities28
  • divide and conquer26
  • *special25
  • games20
  • ternary search17
  • interactive16
  • flows12
  • Other (9 tags)51
  • 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.

    2015

    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.

    2016

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
    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.

    2017

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
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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.

    2018

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

    Jan
    Feb
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    Jun
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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.

    2019

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
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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.

    2020

    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.

    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
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    Dec

    LessMore (max 10/day in 2014)

    2015

    Download PNG

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

    Jan
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    LessMore (max 21/day in 2015)

    2016

    Download PNG

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

    Jan
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    LessMore (max 25/day in 2016)

    2017

    Download PNG

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

    Jan
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    LessMore (max 90/day in 2017)

    2018

    Download PNG

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

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    2019

    Download PNG

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

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    LessMore (max 29/day in 2019)

    2020

    Download PNG

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

    Jan
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    LessMore (max 43/day in 2020)

    2021

    Download PNG

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

    Jan
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    LessMore (max 26/day in 2021)

    2022

    Download PNG

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

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    LessMore (max 24/day in 2022)

    2023

    Download PNG

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

    Jan
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    LessMore (max 5/day in 2023)

    2024

    Download PNG

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

    Jan
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    LessMore (max 21/day in 2024)

    105
    +9
    2404
    2018-09-05 18:35Codeforces Round 507 (Div. 1, based on Olympiad of Metropolises)35+732395
    2018-09-02 16:35Manthan, Codefest 18 (rated, Div. 1 + Div. 2)72+802322
    2018-08-27 18:50AIM Tech Round 5 (rated, Div. 1 + Div. 2)200+132242
    2018-08-19 15:50Codeforces Round 505 (rated, Div. 1 + Div. 2, based on VK Cup 2018 Final)492-542229
    2018-08-17 16:50Codeforces Round 504 (rated, Div. 1 + Div. 2, based on VK Cup 2018 Final)116+532283
    2018-08-11 15:35Codeforces Round 503 (by SIS, Div. 1)157+142230
    2018-07-13 16:45Codeforces Round 497 (Div. 1)110+632216