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zhouzizhe

Open on Codeforces · Unique solved

Rating2190· 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
17
Unique solved
379
Submissions (all)
1,327
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.

  • Unrated8
  • 800–89939
  • 900–9998
  • 1000–109911
  • 1100–119913
  • 1200–129917
  • 1300–139914

Solved by topic

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

  • greedy133
  • math132
  • dp103
  • constructive algorithms81
  • data structures79
  • implementation78
  • brute force

Rating changes

2021

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

Jan
Feb
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May

Submission volume

Download all years PNG

2021

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2025-12-06 10:15Codeforces Round 1069 (Div. 1)156+1052190
2025-09-24 14:50Codeforces Round 1053 (Div. 1)868-902085
2024-06-16 11:05Codeforces Round 953 (Div. 2)32+1152175
2024-01-27 16:45Codeforces Round 921 (Div. 1)675-412060
2023-12-30 16:50Good Bye 2023657+53
1400–1499
10
  • 1500–159910
  • 1600–169910
  • 1700–179918
  • 1800–189912
  • 1900–199922
  • 2000–209915
  • 2100–219915
  • 2200–229912
  • 2300–239920
  • 2400–249927
  • 2500–259922
  • 2600–269915
  • 2700–279911
  • 2800–289911
  • 2900–29996
  • 3000–30999
  • 3100–31998
  • 3200–32995
  • 3300–33995
  • 3400–34995
  • 3500–35991
  • 68
  • trees46
  • number theory41
  • sortings41
  • graphs41
  • binary search38
  • combinatorics36
  • bitmasks34
  • dfs and similar34
  • two pointers26
  • strings23
  • dsu20
  • probabilities19
  • shortest paths16
  • interactive15
  • divide and conquer12
  • hashing10
  • games10
  • string suffix structures10
  • geometry9
  • flows7
  • graph matchings6
  • Other (9 tags)26
  • Jun
    Jul
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    Sep
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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.

    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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    May
    Jun
    Jul
    Aug
    Sep
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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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    Dec

    LessMore (max 21/day in 2021)

    2022

    Download PNG

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

    Jan
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    LessMore (max 42/day in 2022)

    2023

    Download PNG

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

    Jan
    Feb
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    May
    Jun
    Jul
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    Sep
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    LessMore (max 48/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 41/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 9/day in 2025)

    2026

    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 2/day in 2026)

    2101
    2023-09-30 17:35Codeforces Round 901 (Div. 1)962-952048
    2023-08-26 17:35Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2)1143-622143
    2023-06-03 16:35Codeforces Round 876 (Div. 2)10+1662205
    2023-04-29 16:50Codeforces Round 869 (Div. 1)620-622039
    2023-04-08 16:05Codeforces Round 864 (Div. 2)3+2902101
    2023-03-18 14:20Codeforces Round 858 (Div. 2)256+971811
    2023-01-24 16:35Educational Codeforces Round 142 (Rated for Div. 2)1094+591714