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Chika-aki

Open on Codeforces · Unique solved

Rating2148· 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
33
Unique solved
181
Submissions (all)
407
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.

  • Unrated10
  • 800–89946
  • 900–9999
  • 1000–10996
  • 1100–119920
  • 1200–129912
  • 1300–13998

Solved by topic

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

  • greedy109
  • math70
  • implementation63
  • constructive algorithms49
  • brute force46
  • binary search32

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
2025-10-24 16:35Codeforces Round 1061 (Div. 2)30+1292148
2025-03-23 08:05Codeforces Round 1012 (Div. 1)263+962019
2025-03-22 16:35Codeforces Round 1011 (Div. 2)468+341923
2025-03-17 16:35Educational Codeforces Round 176 (Rated for Div. 2)803+81889
2025-03-10 17:15Codeforces Round 1008 (Div. 2)
1400–1499
10
  • 1500–159911
  • 1600–169915
  • 1700–17996
  • 1800–189911
  • 1900–19997
  • 2000–20995
  • 2100–21991
  • 2200–22992
  • 2300–23992
  • dp
    30
  • data structures28
  • sortings27
  • two pointers23
  • bitmasks21
  • strings17
  • number theory15
  • games13
  • graphs11
  • combinatorics10
  • dfs and similar8
  • trees7
  • interactive6
  • geometry4
  • ternary search3
  • dsu3
  • communication3
  • shortest paths2
  • divide and conquer2
  • flows2
  • graph matchings2
  • probabilities2
  • Other (3 tags)4
  • 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 19/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 19/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 10/day in 2026)

    750
    -9
    1881
    2025-02-28 16:50Codeforces Round 1007 (Div. 2)279+891890
    2025-02-27 16:35Educational Codeforces Round 175 (Rated for Div. 2)1928-491801
    2025-02-18 16:35Educational Codeforces Round 174 (Rated for Div. 2)1998-651850
    2025-01-22 14:05Codeforces Round 1000 (Div. 2)329+751915
    2025-01-20 17:35IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2)1507+01840
    2024-12-19 17:35Codeforces Global Round 281007+591840
    2024-12-08 16:35Codeforces Round 992 (Div. 2)979+91781