Chen Hao

• Username: 4★oahcc
• Country:  Taiwan
• Student/Professional:Student
• Institution:National Taiwan University
• 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: 40

Current Ratings Graph Old Ratings Graph

1872 (+18)RatingProvisional
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July Lunchtime 2020 Division 1(2020-07-25 22:30:00)

Global Rank:   257

Cheated in:   

Ratings System Update

(2020-07-25 22:30:00)

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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1872 (-100)RatingProvisional
Rating i Provisional Rating, click to know more

July Lunchtime 2020 Division 1(2022-12-20 00:00:00)

Global Rank:   257

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 (40)

June Cook-Off 2014

Counting Flags, Knapsack Problem, Painting

September Cook-Off 2014, ACM-ICPC Warm up

Sherlock and the Grid, Subarray GCD, Subarray LCM, World War 2

December Cook-Off 2014

Servers, Matrix Again, Player, Good Joke!

June Challenge 2014

Maxim and Progressions, Chef and Digit Jumps, Chef and Subarray, Guessing Game, Forgot Password

July Challenge 2014

Little Elephant and Painting, Garden Game, Chef and Frogs, Count Substrings, Reach The Point, Dish Owner

August Challenge 2014

Chef and Reversing, Chef and Gift

October Challenge 2014

Remy paints the fence, Sereja and two strings, Chef and Ground, Chef and Painting, Chef and Square, Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus

November Challenge 2014

Chef and Segment Game, Distinct Characters Subsequence, Chef and Red Black Tree

December Challenge 2014

Chef and Bracket-Pairs, Chef and Apple Trees

January Challenge 2015

Queries on the String, Chef and A Large Permutation, Sereja and LCM, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries

January Lunchtime 2015

Piece of cake, Candidate walk

February Challenge 2015

Chef and Chain, Chef and Strange Formula, Let us play with rank list, Chef and Equality

March Challenge 2015

Chef and Notebooks

April Challenge 2015

Chef and Interview, Broken Telephone, Chef and Piano Scales

May Challenge 2015

Chef and Prime Divisors, Set Difference , Chef and new recipe

June Challenge 2015

Chef and Memory Limit

August Challenge 2015

Way Out, Gravity Guy, Devu And Churu , Cooking Machine, Aditi and Magic Trick, Chef and insomnia

September Challenge 2015

Chain of Doughnuts, Count Steps in Matrix

October Challenge 2015

Time measure, Count Subarrays, Who dares to be a millionaire

December Challenge 2015

Chef and the stones, Plane Division, Chef and Filters

July Lunchtime 2015

Greedy puppy, Puppy and game, Puppy and cats

February Challenge 2016

Chef-Detective

May Challenge 2016

Laddu

June Challenge 2016

Chef And The Hiring Event, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Devu and an Array

September Challenge 2016

Chef and digits of a number, Faded Palindromes, Chef and calculation

October Challenge 2016

Chef and Keyboard, Chef and Three Dogs

November Challenge 2016

Task for Alexey

January Challenge 2017

Cats and Dogs

February Challenge 2017

Chef and Triangles, Chef and His Apartment Dues

August Long Challenge 2017

Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates

September Challenge 2017

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

October Challenge 2017

Max Mex, A Balanced Contest

November Challenge 2017

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

October Cook-Off 2017

Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries, Chef and Dancing Steps

January Challenge 2018

K-Concatenation, Maximum Score, Rectangle

November Challenge 2018 Division 2

Chef and Ridges, Appy Loves One, Chef and Difficult Contests, Chef and Happiness

June Lunchtime 2019 Division 2

Fuzzy Conversions, Ping Paja Pong, Magda and Silly Pairs, The Grux Permutation , Igzi and Burly Array

July Challenge 2019 Division 1

Hit the Coconuts, Snake and Apple Tree, Guess the Prime!, Codechef War, Circular Merging

August Challenge 2019 Division 1

Guddu and his Mother, Dilemma

July Lunchtime 2020 Division 1

Binary Concatenation

Total Problems Solved: 140