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xiaofan7

Open on Codeforces · Unique solved

Rating2139· 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
63
Unique solved
806
Submissions (all)
2,526
Years with activity
2019–2023

Solved by problem rating

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

  • Unrated45
  • 800–89967
  • 900–99935
  • 1000–109940
  • 1100–119928
  • 1200–129930
  • 1300–139937

Solved by topic

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

  • greedy329
  • math259
  • implementation230
  • dp195
  • constructive algorithms175
  • data structures158

Rating changes

2019

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2019

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2020-11-30 16:35Educational Codeforces Round 99 (Rated for Div. 2)111+602139
2020-11-21 16:50Codeforces Round 685 (Div. 2)147+682079
2020-11-19 16:35Educational Codeforces Round 98 (Rated for Div. 2)429-62011
2020-10-27 16:35Educational Codeforces Round 97 (Rated for Div. 2)228+472017
2020-10-18 11:05Codeforces Round 676 (Div. 2)
1400–1499
42
  • 1500–159953
  • 1600–169952
  • 1700–179967
  • 1800–189944
  • 1900–199945
  • 2000–209954
  • 2100–219941
  • 2200–229940
  • 2300–239925
  • 2400–249922
  • 2500–259916
  • 2600–269911
  • 2700–27993
  • 2800–28993
  • 2900–29991
  • 3000–30992
  • 3100–31992
  • 3200–32991
  • brute force
    147
  • sortings124
  • binary search108
  • dfs and similar87
  • graphs80
  • strings68
  • two pointers64
  • number theory60
  • bitmasks57
  • trees57
  • combinatorics51
  • shortest paths27
  • dsu26
  • divide and conquer22
  • hashing16
  • interactive15
  • games12
  • geometry12
  • probabilities8
  • string suffix structures6
  • *special6
  • ternary search6
  • Other (7 tags)22
  • 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.

    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.

    May
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    LessMore (max 36/day in 2019)

    2020

    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 31/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
    Nov
    Dec

    LessMore (max 30/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 31/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 15/day in 2023)

    237
    +57
    1970
    2020-10-17 15:35Codeforces Raif Round 1 (Div. 1 + Div. 2)2243-721913
    2020-09-30 17:20Grakn Forces 20201162-71985
    2020-09-24 16:35Codeforces Round 672 (Div. 2)287+571992
    2020-09-12 15:45Codeforces Round 670 (Div. 2)676+121935
    2020-05-28 16:35Educational Codeforces Round 88 (Rated for Div. 2)640+341923
    2020-05-26 16:35Codeforces Round 645 (Div. 2)1022+101889
    2020-05-16 13:35Codeforces Round 643 (Div. 2)268+1301879