Hiroki Sato

• Username: 4★tossy
• Country:  Japan
• Student/Professional:Student
• Institution:Waseda University, Japan
• CodeChef Pro Plan: No Active Plan. View Details

Activity Heat Map

Last 6 Months 2025 (Jan-Jun)2024 (Jul-Dec)2024 (Jan-Jun)

Rating Graph

No. of Contests Participated: 2

Current Ratings Graph Old Ratings Graph

1930? (+285)RatingProvisional
Rating i Provisional Rating, click to know more

May Challenge 2018 Division 2(2018-05-14 15:00:00)

Global Rank:   18

Cheated in:   

Ratings System Update

(2018-05-14 15:00:00)

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

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1930? (+64)RatingProvisional
Rating i Provisional Rating, click to know more

May Challenge 2018 Division 2(2022-12-20 00:00:00)

Global Rank:   18

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 (2)

November Challenge 2017

Chef Hates Palindromes, Chef goes Left Right Left, Periodic Palindrome Construction, Villages and Tribes

May Challenge 2018 Division 2

S-T Mincut, Mighty Friend, Change the Signs, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs

Total Problems Solved: 15