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jinqihao2026

Open on Codeforces · Unique solved

Rating2975· 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
49
Unique solved
978
Submissions (all)
3,091
Years with activity
2023–2026

Solved by problem rating

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

  • Unrated6
  • 800–89947
  • 900–9998
  • 1000–109911
  • 1100–119915
  • 1200–129913
  • 1300–139922

Solved by topic

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

  • math337
  • dp326
  • greedy297
  • data structures276
  • constructive algorithms217
  • brute force168
  • trees

Rating changes

2023

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

2023

Download PNG

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

Jan
Feb
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Apr

Recent rated rounds

When (UTC)ContestRankΔNew
2025-11-06 17:35Codeforces Global Round 30 (Div. 1 + Div. 2)22+662975
2025-09-24 14:50Codeforces Round 1053 (Div. 1)30+592909
2025-08-07 17:35Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2)55+272850
2025-07-19 16:50Order Capital Round 1 (Codeforces Round 1038, Div. 1 + Div. 2)42+722823
2025-04-19 16:35Neowise Labs Contest 1 (Codeforces Round 1018, Div. 1 + Div. 2)
1400–1499
18
  • 1500–159911
  • 1600–16997
  • 1700–179924
  • 1800–189918
  • 1900–199923
  • 2000–209916
  • 2100–219921
  • 2200–229917
  • 2300–239925
  • 2400–249928
  • 2500–259924
  • 2600–269936
  • 2700–279945
  • 2800–289995
  • 2900–2999103
  • 3000–3099102
  • 3100–319984
  • 3200–329984
  • 3300–339938
  • 3400–349917
  • 3500–359920
  • 163
  • graphs148
  • implementation143
  • combinatorics125
  • dfs and similar120
  • binary search112
  • sortings94
  • bitmasks87
  • number theory76
  • divide and conquer64
  • two pointers53
  • strings52
  • dsu49
  • interactive46
  • probabilities45
  • games38
  • flows37
  • matrices33
  • geometry32
  • fft31
  • shortest paths30
  • hashing27
  • Other (8 tags)70
  • 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
    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 35/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 30/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 31/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 9/day in 2026)

    29
    +140
    2751
    2025-03-23 08:05Codeforces Round 1012 (Div. 1)82+82611
    2025-03-10 17:15Codeforces Round 1008 (Div. 1)141-72603
    2024-12-19 17:35Codeforces Global Round 28109+432610
    2024-10-27 17:35Codeforces Global Round 27119+462567
    2024-10-20 11:05Codeforces Round 980 (Div. 1)440-982521
    2024-09-27 16:05Codeforces Round 975 (Div. 1)182-282619
    2024-08-30 17:05Codeforces Round 969 (Div. 1)59+742647