Hiroshi Ogawa

• Username: 4★hiro18181
• Country:  Japan
• Student/Professional:Other
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

Last 6 Months 2026 (Jan-Jun)2025 (Jul-Dec)2025 (Jan-Jun)

Rating Graph

No. of Contests Participated: 6

Current Ratings Graph Old Ratings Graph

1949 (+60)RatingProvisional
Rating i Provisional Rating, click to know more

December Cook-Off 2020 Division 1 (2020-12-22 00:00:00)

Global Rank:   197

Cheated in:   

Ratings System Update

(2020-12-22 00:00:00)

This is the difference due to changing the rating system.This graph is not updated after 20th Dec 2022. Know more

How the rating system works?

1949 (-80)RatingProvisional
Rating i Provisional Rating, click to know more

December Cook-Off 2020 Division 1 (2022-12-20 00:00:00)

Global Rank:   197

Cheated in:   

Ratings System Update

(2022-12-20 00:00:00)

This is the difference due to changing the rating system.This graph is not updated after 20th Dec 2022. Know more

How the rating system works?

Learning Paths (0)

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Practice Paths (0)

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Contests (6)

September Challenge 2020 Division 2

Ada Matrix, A Problem on Sticks

October Challenge 2020 Division 2

Positive AND, Replace for X, D-Dimensional MST, Covid Run, Chef and Easy Queries

November Challenge 2020 Division 1

Restore Sequence

December Challenge 2020 Division 2

Positive Prefixes, Vaccine Distribution, Vaccine Production, Even Pair Sum, String Operations, Square Root of LCA Convolution, Hail XOR

December Cook-Off 2020 Division 1

Self-Destructing Strings, Circle of Chaos

October Lunchtime 2020 Division 2

AND Plus OR, Chef and Subtree MEXs, Chef Likes Good Sequences, Cute Chef Gift

July Challenge 2021 Division 1 (Unrated)

XxOoRr

Total Problems Solved: 112