Jaehyun Koo

• Username: 6★gs14004
• Country:  South Korea
• Student/Professional:Other
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

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

Rating Graph

No. of Contests Participated: 17

Current Ratings Graph Old Ratings Graph

2365 (+82)RatingProvisional
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SnackDown 2021 - Online Elimination Round (Rated for all)(2021-12-13 16:30:00)

Global Rank:   5

Cheated in:   

Ratings System Update

(2021-12-13 16:30:00)

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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2365 (-234)RatingProvisional
Rating i Provisional Rating, click to know more

SnackDown 2021 - Online Elimination Round (Rated for all)(2022-12-20 00:00:00)

Global Rank:   5

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 (17)

February Lunchtime 2015

Heavy-light Decompositions, Lucky Four

February Challenge 2016

Sereja and Two Lines, Chef and Strange Operations, Devu and a light discussion, Rectangles of Love, Chef-Detective, Matrix Maximum Sum, Sereja and Permutations

November Challenge 2017

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

June Cook-Off 2018 Division 2

Sonya and Segments, Archi and Comparsion, Good Permutations

August Challenge 2018 Division 1

Modular GCD, Safe Partition

December Challenge 2018 Division 1

Chef and Interactive XOR, Directing Edges, Max and Electrical Panel

October Challenge 2018 Division 1

Appy and Balloons , Minimize Digitsum, Chef and Surprise Chessboard

October Challenge 2019 Division 1

Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Fun with Lists, Array Modification, Faulty System

November Challenge 2019 Division 1

Physical Exercise, From Zero to Infinity, A Simple Game, Single Point of Failure, D-Dart

February Challenge 2020 Division 1

Chef and Gordon Ramsay 2

May Challenge 2020 Division 2

Precise Bipartite Pairing, Isolation Centers, Coronavirus Spread, Chef and Bitwise Product, Precise Pairing, Not a Real World Problem

May Cook-Off 2020 Division 1

Chef, Chefina and Their Friendship, Chefland Squads and the Army Chief, Chefina on a Trip, Roads in Chefland

October Challenge 2020 Division 1

Inversions, Positive AND, Random Knapsack, Rooted Minimum Spanning Tree, Replace for X, D-Dimensional MST, Compress all Subsegments, Adding Squares

September Lunchtime 2020 Division 1

Root the Tree, Robot Detector

SnackDown 2021 - Online Qualifiers

Lucky Number

SnackDown 2021 - Online Round 1A

Round Robin Ranks , Dance Moves, Min Max LCM, Yet Another Flipping Problem

SnackDown 2021 - Online Pre-Elimination

Mega mu - 1, Guests like slippers, Product Pain, Good ranking, Non-Decreasing Subsequence of size K

SnackDown 2021 - Online Elimination Round (Rated for all)

One Change Subsequences, Random Convex Hull, Graduate Work Matters, Sorting Segments, Sorter Prodigy

SnackDown 2021 - Final Round

Ones Guessing, Finally, Non Ad-Hoc Problem, AND of Maximums

Total Problems Solved: 118