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1234huang

Open on Codeforces · Unique solved

Rating2156· 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
13
Unique solved
221
Submissions (all)
685
Years with activity
2022–2026

Solved by problem rating

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

  • Unrated12
  • 800–89920
  • 900–9994
  • 1000–109910
  • 1100–11997
  • 1200–12996
  • 1300–13993

Solved by topic

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

  • math72
  • dp61
  • greedy59
  • data structures57
  • constructive algorithms47
  • brute force31
  • implementation

Rating changes

2022

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

Jan
Feb
Mar
Apr
May

Submission volume

Download all years PNG

2022

Download PNG

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

Jan
Feb
Mar
Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2023-10-22 13:05Codeforces Round 905 (Div. 2)16+1572156
2023-10-08 11:35Codeforces Round 902 (Div. 2, based on COMPFEST 15 - Final Round)2+3721999
2023-02-12 10:35Codeforces Round 852 (Div. 2)774+731627
2022-08-13 16:50Codeforces Round 813 (Div. 2)2317+161554
2022-08-06 16:35Codeforces Round 812 (Div. 2)
1400–1499
7
  • 1500–15993
  • 1600–16994
  • 1700–17996
  • 1800–189911
  • 1900–19998
  • 2000–20998
  • 2100–21995
  • 2200–22999
  • 2300–239910
  • 2400–24999
  • 2500–259910
  • 2600–269911
  • 2700–279912
  • 2800–28994
  • 2900–29996
  • 3000–30995
  • 3100–31993
  • 3200–32997
  • 3300–339911
  • 3400–34995
  • 3500–35995
  • 30
  • trees30
  • combinatorics29
  • graphs29
  • dfs and similar25
  • sortings18
  • number theory17
  • divide and conquer17
  • binary search16
  • strings11
  • dsu11
  • bitmasks10
  • games10
  • geometry8
  • hashing7
  • fft7
  • two pointers6
  • shortest paths6
  • interactive5
  • flows5
  • matrices4
  • probabilities4
  • Other (5 tags)10
  • 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.

    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 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 27/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 31/day in 2024)

    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 39/day in 2026)

    1852
    +34
    1538
    2022-07-16 16:35Codeforces Round 808 (Div. 2)3146-161504
    2022-06-25 16:50Codeforces Global Round 212409+411520
    2022-06-19 11:05Codeforces Round 802 (Div. 2)2475+421479
    2022-06-18 16:35Codeforces Round 801 (Div. 2) and EPIC Institute of Technology Round1356+1771437
    2022-06-03 16:35Codeforces Round 796 (Div. 2)1067+2791260
    2022-04-30 16:35Codeforces Round 785 (Div. 2)4070+242981
    2022-04-22 16:35Educational Codeforces Round 127 (Rated for Div. 2)3294+378739