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froggyzhang

Open on Codeforces · Unique solved

Rating2940· International 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
26
Unique solved
2,570
Submissions (all)
5,953
Years with activity
2019–2026

Solved by problem rating

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

  • Unrated55
  • 800–899195
  • 900–99958
  • 1000–109964
  • 1100–119955
  • 1200–129981
  • 1300–139968

Solved by topic

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

  • math833
  • greedy823
  • dp692
  • data structures598
  • constructive algorithms553
  • implementation498

Rating changes

2019

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

Jan
Feb
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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
2022-03-20 13:50Codeforces Round 778 (Div. 1 + Div. 2, based on Technocup 2022 Final Round)33+202940
2022-02-23 12:10Codeforces Round 773 (Div. 1)14+1242920
2022-01-27 16:35Codeforces Round 768 (Div. 1)131-662796
2021-12-29 17:35Good Bye 2021: 2022 is NEAR73+72862
2021-11-28 17:05Deltix Round, Autumn 2021 (open for everyone, rated, Div. 1 + Div. 2)
1400–1499
75
  • 1500–159981
  • 1600–169983
  • 1700–179986
  • 1800–189989
  • 1900–199989
  • 2000–209979
  • 2100–219993
  • 2200–2299103
  • 2300–2399138
  • 2400–2499181
  • 2500–2599145
  • 2600–2699143
  • 2700–2799135
  • 2800–289987
  • 2900–299987
  • 3000–309969
  • 3100–319962
  • 3200–329961
  • 3300–339946
  • 3400–349933
  • 3500–359929
  • brute force
    438
  • graphs351
  • binary search289
  • sortings284
  • trees276
  • dfs and similar276
  • number theory243
  • combinatorics239
  • bitmasks211
  • two pointers178
  • strings172
  • divide and conquer125
  • interactive107
  • dsu105
  • geometry89
  • shortest paths89
  • probabilities74
  • games70
  • hashing68
  • flows56
  • fft53
  • matrices41
  • Other (9 tags)162
  • 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.

    2024

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

    Jan
    Feb
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    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
    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
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    LessMore (max 21/day in 2019)

    2020

    Download PNG

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

    Jan
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    LessMore (max 75/day in 2020)

    2021

    Download PNG

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

    Jan
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    Jun
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    LessMore (max 57/day in 2021)

    2022

    Download PNG

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

    Jan
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    Jun
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    LessMore (max 59/day in 2022)

    2024

    Download PNG

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

    Jan
    Feb
    Mar
    Apr
    May
    Jun
    Jul
    Aug
    Sep
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    Dec

    LessMore (max 31/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 26/day in 2025)

    2026

    Download PNG

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

    Jan
    Feb
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    May
    Jun
    Jul
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    Dec

    LessMore (max 15/day in 2026)

    53
    +18
    2855
    2021-10-30 16:35Codeforces Round 752 (Div. 1)28+922837
    2021-10-17 13:20Codeforces Round 749 (Div. 1 + Div. 2, based on Technocup 2022 Elimination Round 1)59+252745
    2021-05-30 16:50Deltix Round, Spring 2021 (open for everyone, rated, Div. 1 + Div. 2)46+912720
    2021-03-21 15:35Codeforces Round 709 (Div. 1, based on Technocup 2021 Final Round)21+1582629
    2021-02-07 16:50Codeforces Round 700 (Div. 1)165+312471
    2020-10-17 15:35Codeforces Raif Round 1 (Div. 1 + Div. 2)113+832440
    2020-09-30 17:20Grakn Forces 2020145+882357