Hirotaka Isa

• Username: 7★akatorihasi180
• Country:  Japan
• Student/Professional:Student
• Institution:The University of Tokyo
• CodeChef Pro Plan: No Active Plan. View Details

Submissions Heat Map

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

Rating Graph

No. of Contests Participated: 19

Current Ratings Graph Old Ratings Graph

2703 (+37)RatingProvisional
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July Cook-Off 2022 Division 1 (Rated)(2022-07-03 22:30:00)

Global Rank:   16

Cheated in:   

Ratings System Update

(2022-07-03 22:30:00)

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2703 (+21)RatingProvisional
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July Cook-Off 2022 Division 1 (Rated)(2022-12-20 00:00:00)

Global Rank:   16

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 (19)

Lunch Time June 2013

Number of Factors, Online Shopping

Lunch Time July 2013

Cooking dishes, Optimal Trip

August Cook-Off 2013

Chef and The Right Triangles

July Challenge 2014

Count Substrings, Reach The Point

January Lunchtime 2014

Chef and Numbers, Chef and Way, Chef and String, Chef and Shop

April LunchTime 2014

Minimum Product, Knight Fork

March Lunchtime 2014

Statements Checking

May Lunchtime 2014

Approximately II

February Lunchtime 2015

Lucky Four

September Challenge 2017

Fill The Matrix, Little Chef and Sums, Weasel does Xor on Tree, Minimum Good Permutation, Sereja and Commands, Chef and Pick Digit, Sum of Cubes

April Lunchtime 2019 Division 1

Dream Problem, Firdavs and Planet F, Minimum Sum, Chef Rami and Inventions

December Cook-Off 2020 Division 1

Self-Destructing Strings, Sed Passwords, Circle of Chaos, Carry All Fruits

December Lunchtime 2020 Division 1 (Unrated)

Three Letters, One Zero Swaps

SnackDown 2021 - Online Qualifiers

Lucky Number, Maximum Number Of Distinct Elements

SnackDown 2021 - Online Round 1A

Round Robin Ranks , Dance Moves, Equal Beauty, Min Max LCM

SnackDown 2021 - Online Pre-Elimination

Non-Decreasing Subsequence of size K, Guess the row, Mega mu - 2, Mega mu - 1, Product Pain, Good ranking, Guests like slippers

SnackDown 2021 - Online Elimination Round (Rated for all)

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

SnackDown 2021 - Final Round

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

December Cook-Off 2021 Division 1

Binary String Game, Destructive Nim, Ticket Machine, RGB Construction, Break the Balance

December Lunchtime 2021 Division 1

Optimal Sorting, Point constraints, Sleep Technique , Romantic Reversals, In-tree-active Node Coloring

January Cook-Off 2022 Division 1

Unreasonable Updates, Subsegment Divisibility , Merged LIS, Boring Trip, Prime Graph, Beautiful Permutation, Erase All But One

January Lunchtime 2022 Division 1

Circular Permutation Recovery, Permutation XOR Sum, Permutation Deletion

July Cook-Off 2022 Division 1 (Rated)

String Break, Partition Queries, Segmentation Fault, Subsequence LCM

Total Problems Solved: 89