Koga Osamu

• Username:3★osa_k
• Student/Professional:Student
• Institution:Tokyo Institute of Technology
• 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

1765? (-27)RatingProvisional
Rating i Provisional Rating, click to know more

September Challenge 2012(2012-09-11 15:00:00)

Global Rank:   568

Cheated in:   

Ratings System Update

(2012-09-11 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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1765? (+71)RatingProvisional
Rating i Provisional Rating, click to know more

September Challenge 2012(2022-12-20 00:00:00)

Global Rank:   568

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)

April Challenge 2012

PDS Number, Lucky Array, Parallel Computing, Fit to Play, Double Strings, Stacking Pancakes, Greatest Dumpling Fight, Similar Graphs

September Challenge 2012

Kisses & Hugs, Racing Horses, Three is Crowd

Total Problems Solved: 11