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zhangzheng2026

Open on Codeforces · Unique solved

Rating2123· 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
11
Unique solved
386
Submissions (all)
1,377
Years with activity
2024–2026

Solved by problem rating

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

  • Unrated18
  • 800–89914
  • 900–9991
  • 1100–11996
  • 1200–12993
  • 1300–13993
  • 1400–14994

Solved by topic

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

  • dp146
  • math146
  • greedy120
  • data structures106
  • constructive algorithms81
  • brute force74
  • dfs and similar

Rating changes

2024

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2024

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2026-03-14 16:35Codeforces Round 1086 (Div. 2)125+582123
2025-12-06 10:15Codeforces Round 1069 (Div. 1)370+242065
2025-11-23 12:35Codeforces Round 1066 (Div. 1 + Div. 2)328+1102041
2025-08-07 17:35Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2)1050+241931
2025-06-15 11:05Codeforces Round 1031 (Div. 2)
1600–1699
3
  • 1700–17994
  • 1800–18996
  • 1900–19995
  • 2000–20998
  • 2100–219910
  • 2200–229920
  • 2300–239923
  • 2400–249962
  • 2500–259926
  • 2600–269927
  • 2700–279979
  • 2800–289923
  • 2900–299913
  • 3000–30999
  • 3100–31995
  • 3200–32998
  • 3300–33994
  • 3400–34992
  • 73
  • combinatorics71
  • trees69
  • graphs67
  • implementation67
  • binary search59
  • bitmasks50
  • sortings46
  • divide and conquer36
  • dsu31
  • number theory27
  • two pointers25
  • probabilities24
  • shortest paths16
  • flows16
  • hashing15
  • strings14
  • fft14
  • games12
  • graph matchings12
  • interactive11
  • matrices11
  • Other (7 tags)35
  • 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
    Jun
    Jul
    Aug
    Sep
    Oct
    Nov
    Dec

    LessMore (max 18/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 33/day in 2025)

    2026

    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 22/day in 2026)

    357
    +27
    1907
    2025-04-26 11:35Codeforces Round 1021 (Div. 2)32+2301880
    2025-04-19 16:35Neowise Labs Contest 1 (Codeforces Round 1018, Div. 1 + Div. 2)762+2551650
    2025-02-28 16:50Codeforces Round 1007 (Div. 2)1246+2431395
    2025-01-22 14:05Codeforces Round 1000 (Div. 2)3576+2701152
    2024-10-20 11:05Codeforces Round 980 (Div. 2)1879+405882
    2024-09-27 16:05Codeforces Round 975 (Div. 2)5382+477477