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Programming and DSA

Learn to think like a programmer. Develop your problem-solving skills with essential data structures and algorithms.

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Programming and DSA

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Programming and DSA

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Practice Compete Compiler
Home » Huang I-Wen
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Huang I-Wen

  • 7★dreamoon4
  •   Taiwan
  • Professional
  • AACP SCHOOL
  • No Active Plan. View Details

Submissions Heat Map

Rating Graph

No. of Contests Participated: 120
2551 (-39)RatingProvisional
Rating i Provisional Rating, click to know more
Starters 181 (Rated for all)(2025-04-09 22:30:00)
Global Rank:   70
Cheated in:   

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(2025-04-09 22:30:00)
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2590 (-119)RatingProvisional
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May Lunchtime 2022 Division 1 (Rated)(2022-12-20 00:00:00)
Global Rank:   8
Cheated in:   

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Learning Paths (0)

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Practice Paths (0)

None

Contests (120)

March Cook-Off 2014

Game of Divisors, ABC-Strings, XOR Minimization, 3-Palindromes, Dividing Stamps

April Cook-Off 2014

Snape and Ladder, BiCo Gaming Grid, Travelling Chef Problem, Distant Relatives

May Cook-Off 2014

Substrings and Repetitions, Book Game with Chef, Divide the Cake, Ups and Downs

July Cook-Off 2014

Copy-Paste, Sum Queries, Tree Again, Friends

August Cook-Off 2014

Tree Game, Permutation Shuffle, Shooting

September Cook-Off 2014, ACM-ICPC Warm up

Sherlock and the Grid, Subarray GCD, Subarray LCM, World War 2, Updating Edges on Trees

October Cook-Off 2014

The Dirty Path, The Army, Walk on the Axis, Mahesh and his lost array

November Cook-Off 2014

Covering Sets, Lost Graph, Most Distant Points, Brackets, Petersen Graph

December Cook-Off 2014

Servers, Jam, Matrix Again, Player, Good Joke!

March Challenge 2014

Sereja and Sorting 2, Team Split, Binary Tournament, Walk, Maximum number, GCD condition, The Street , Little Chef and Numbers, Mike and Stamps, A Story with Strings, Chef and Graph Queries

April Challenge 2014

Final Battle of Chef, Sereja and Permutation, Counting Matrices, Farmer Feb, Cards, bags and coins, Chef and Digits, Divide the Tangerine, Chef and Tree Game, Shortest Path in Binary Trees

May Challenge 2014

Little Elephant and Balloons, Sereja and Game, Compilers and Parsers, Dynamic Trees and Queries, Chef-jumping, Fun with AGp, Sereja and Subsegment Increasings, Chef and Strange Matrix, The Malaysian Flight Search, Stone

June Challenge 2014

Little Elephant and Blocks, Maxim and Progressions, Chef and Functions, Chef and Digit Jumps, Chef and Subarray, Two Companies, Guessing Game, Forgot Password

July Challenge 2014

Little Elephant and Painting, Garden Game, Chef and Frogs, Sereja and Equality, Chef and Rectangle Genome, Count Substrings, Reach The Point, Dish Owner, Lucky Game, Game of Numbers

September Challenge 2014

Sereja and Bubble Sort, Chef and Rainbow Array - 2, Chef and Swaps, Chef and Left-Right, Chef and sequence, Rectangle Query, Fun with Rotation, Flooring

October Challenge 2014

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

November Challenge 2014

Chef and Segment Game, Chef and Words, Fombinatorial, Sereja and Order, Sereja and Permutations, Distinct Characters Subsequence, Chef and Red Black Tree, Let us construct palindrome, Chef and Churu, The Spelling Problem

December Challenge 2014

Chef Under Pressure, Alok-nath and His Sanskars, Chef and Bracket-Pairs, XOR with Subset, Course Selection, Chef and Apple Trees, Sereja and GCD, Good galaxy

April LunchTime 2014

Minimum Product, Minion Circle, Knight Fork, Tracy and Charlie

September Lunchtime 2014

Chef and easy problem, Chef and easy problem 2, Chef and medium problem , Chef and medium problem 2

October Lunchtime 2014

Tanu and Head-bob, And Tuples, Physics Class, Cascading Style Sheets

November Lunchtime 2014

A wolf, a sheep and cabbage, Deja Vu, Yet another substring problem, Dividing the Students

February Challenge 2015

Chef and Chain, Time to Study Graphs with Chef, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Chef and Equality

March Challenge 2015

Count Substrings, Chef and Notebooks, Chef and Problems, Sereja and Random Array, Devu and his Class, Sign Wave, Matrix, Counting on a Tree

April Challenge 2015

Count Sequences, Chef and Array, Chef and Interview, Broken Telephone, Inversion sorting, Chef and Piano Scales, Devus and their voting system

May Challenge 2015

Devu and his three Hands, Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Balanced Strings, Chef and Cake, Special Economic Zone

June Challenge 2015

Sereja and Matrix Division, Steady tables, Chef and His Friend, Chef and Memory Limit, Chef and Polygons, Another Fibonacci, Anticommutative implication, Chef and String, Chefbook, Connect Points

July Challenge 2015

Addition and Multiplication, Maximum Difference Walk, Sereja and Game 2, Bread, MasterChef, Na2a and lucky stone, Chef and Cube, Rohith and Circles, Easy exam

August Challenge 2015

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

September Challenge 2015

Filling the maze, 3D Queries, Chain of Doughnuts, Nikitosh and xor, Count Steps in Matrix, Terrible vectors, Bank robbery, Lighthouses, Cracking the Code, Chef and Chetris

October Challenge 2015

Time measure, Count Subarrays, Who dares to be a millionaire, Spheres, Cyclic shifts in permutation, Rupsa and Equilateral Triangle, LCM equation

December Challenge 2015

Sereja and Dividing, Chef and cinema, Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Misha and Permutation, Chef and Filters, Chef and Girls

April Cook-Off 2015

Lucky Fives, Equality, Version Control System

May Cook-Off 2015

Devu, his friends and birthday gifts, Devu and friendship testing, Devu and decorating birthday cake, Devu and most energetic minion

June Cook-Off 2015

Ankit, Srijan and a game of stone piles, Bored of Nim, VS and his marking scheme, Longest non regular parentheses sub-sequence, Strange operations

July Cook-Off 2015

Cops and the Thief Devu, Maximize Disjoint Pair Sum, Path containing K Nodes, Adding Special Sum

August Cook-Off 2015

Chef and the Cards, Chef and the XORed Number , Chef and the Number Sequence, Chef and the Wildcard Matching

September Mega Cook-Off 2015

Reign 2, Counting Subgraphs, Forgotten Language, Super Numbers, Stacks

February Lunchtime 2015

Lucky Four, Heavy-light Decompositions, The Warehouse

February Challenge 2016

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

March Challenge 2016

Sereja and Two Strings 2, Palindromic substrings, Floor Distribution, maximize the sum, Parity tree, Chef And Special Dishes

April Challenge 2016

Amazing Experiment, Mario and Luigi, Help Watson Escape, Fibonacci Queries, Chef and Big Matrix, Chef and Ballons, Devu and good strings, Chef And Magical Path, Chef And Coloring, Game of snakes on a grid

May Challenge 2016

Sereja and GCD 2, Easy Queries, Chef and math, Chef and Balls, Forest Gathering, Chef and Amazingness of Numbers, Chef and Big Soccer, Laddu

June Challenge 2016

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

July Challenge 2016

Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and special numbers, Evaluate the polynomial, Chef and Robots Competition, Chefland and Electricity, Chef and Polyhedron, Defend the Recipe, Scheduling jobs on a cluster

August Challenge 2016

Chef and His Garden, Fighting Ebola, Chef and Circle Run, Chef and Chocolate, Chef and Round Run, Funny gnomes, Maximum Grid, Chef and Guard Towers, A Good Problem

October Challenge 2016

Sereja and Stones, Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs, Chef and Two String, Bear and Shuffled Points

November Challenge 2016

Count Permutations, Friends Meeting, Urban Development, Gift and Chef, Chef and squares, Task for Alexey

July Cook-Off 2016

Chef and Proportion, Chef and Numbers, Chef and Land, Chef and Array, Chef and Sort

September Cook-Off 2016

Lazy Jem, The Lost Arithmetic Sequences, Counting Strings, Shortest path queries, Find The Point

October Cook-Off 2016

Sherlock and the Ugly Flower, Watson asks Does Permutation Exist, Sherlock Counts Ways, ChefWatson uses Social Network

November Cook-Off 2016

Sebi and the equation 2, Sebi and the cube, Sebi and the black money, Sebi and the corrupt goverment

February Lunchtime 2016

Chef and Socks, Chef and Tic-Tac-Toe, Chef and Dominating Subarrays

March Lunchtime 2016

Two Closest, Arrays Sum, Simple Statistics, ABABAABA

April Lunchtime 2016

Maximum K Sums, Tree Coloring, Coins And Triangle

July Lunchtime 2016

Will and Closed Set, Drumpf for President!, Lumpy - The Bus Driver, So Close Yet So Far

August Lunchtime 2016

Studying Alphabet

January Cook-Off 2017

Digit Longest Increasing Subsequences, Matrix Transformation, Digit Longest Increasing Subsequences 2

June Challenge 2017

Chef and Prime Queries, A Good Set, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets

August Long Challenge 2017

Chef and Rainbow Array, Chef And Fibonacci Array, Chef and Mover, Hill Jumping, Palindromic Game, Mathison and the Data Warehouse (Challenge), Greedy Candidates, Strings and Graphs, Flower Pots

September Challenge 2017

Sereja and Commands, Sereja and Functions (Challenge), Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Querying on a Grid, Weasel does Xor on Tree, Weasel finds Staircase, Fill The Matrix, Little Chef and Sums

May Cook-Off 2017

La Liga, Balanced Array, Hussain Set, Nasty Queries

June Cook-Off 2017

Ada and crayons, Knight Covering, A Study in Bake Street, SnackUp, Centeroid

July Cook-Off 2017

Chang and Bitwise OR, Chang and the Perfect Function, Chang and Perfect Quadruples, Chang and Beautiful Sequences, Bipartite Graph from Trees

October Cook-Off 2017

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

December Cook-Off 2017

Minimum SubArray, Beautiful Array, Football Match

June Lunchtime 2017

Maximum Unique Segment, Two Numbers, Company and Club Hierarchies

July Lunchtime 2017

Find the Maximum Value, Good Pairs, Travel to all Points, Divide the Set

September Lunchtime 2017

Chef and Dice, Chef and Cook-Off Contests, Chef and Programming Contest by His Friend

February Cook-Off 2018

Chef and Cook-Off, Chef and Tuples, Chef and Chefness, Chef and Line

March Cook-off 2018 Division 1

Maximum Tree Path, Chef Goes to the Cinema, Chef Restores an Array, Chef Chooses a Subset, Chef Restores a Matrix

April Cook-off 2018 Division 1

Run Direction, Binary Nim, Chef Goro

July Cook-Off 2018 Division 1

Sticks, OR Matrix, Chef and GCD Game

August Challenge 2018 Division 1

Coordinate Compression , Modular GCD

September Challenge 2018 Division 1

Bad Shuffle

December Challenge 2018 Division 1

Directing Edges, Edge Addition, Chef and Interactive XOR, Chef and Interactive Contests

October Challenge 2018 Division 1

Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Coprime Components

August Lunchtime 2018 Division 1

Chef and Eid, Mix Mix Game

Insomnia 2018 (Rated)

Correct Bracket Sequence, So Straight, Count Nodes, Split Sums, A Game of Game, DP Made Easy, Strange Swaps, Function Function

January Challenge 2019 Division 1

Yet Another Problem About Sequences, Different Neighbours, Partition the Graph, Distinct Pairs, Party, A Pizza Slice

Plinth-Enigma'19 LNMIIT Techfest - (Rated for all)

XOR! Wait for it, Return of the Gargoyle King, Ross goes for Shopping, Summation over nCr

February Challenge 2019 Division 1

Manhattan Rectangle, Chef and Secret Ingredients, Xor Decomposition, Art of Balance

February Cook-Off 2019 Division 1

Max Range Queries, Chef and Secret Password, Chef and Party

March Challenge 2019 Division 1

Yet Again a Subarray Problem

April Challenge 2019 Division 1

Offer for Chef, Kira Loves Palindromes, Playing with Numbers, Subtree Removal

April Lunchtime 2019 Division 1

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

May Challenge 2019 Division 1

Ada Rooks 2, Trees and Degrees, Where to Build the Roads, Ada Pawns

June Challenge 2019 Division 1

Lent Money, Count Arrays, Chef and Ingredients, Sum and GCD

June Cook-Off 2019 Division 1

The Secret Recipe

September Challenge 2019 Division 1

Chef Designed a Network

October Challenge 2019 Division 2

Even Edges, Missing Number, Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices

November Challenge 2019 Division 1

From Zero to Infinity, A Simple Game

December Challenge 2019 Division 2

Chefina and Ranges, Plus Multiply, Binary XOR, Easy Subsequence Selection, Sticky Notes, That Is My Score!, Addition

December Cook-Off 2019 Division 1

Xor It

Alkhwarizm (Rated for all)

Arya and the Grid of Stars, Weirwood Trees, Danny Wants To Know

January Challenge 2020 Division 1

Chef and Dynamo, Doraemon, Doofish Matrix, Chefina and Prefix Suffix Sums, English, Chefland Army

February Challenge 2020 Division 1

No Change Required

March Challenge 2020 Division 1

Chef and DAG, Lasers Everywhere

April Challenge 2020 Division 1

Strange Number, Squared Subsequences

February Cook-Off 2020 Division 1

Must Be Divisible, Maximum Subsequence Sum, XOR Game, Sweetest Candy , Chef and Pepperoni Pizza Again

May Lunchtime 2020 Division 1

Convert the String

June Challenge 2020 Division 1

The Tom and Jerry Game!

September Challenge 2020 Division 1

Chefina and Swap, Chef and Trump Cards, Find XOR, Ada Matrix

July Lunchtime 2020 Division 1

Profitable Paths 2, Golomb Sequence, Binary Concatenation , Pairs of Pairs

June Lunchtime 2020 Division 2

Maximum AND, Chef and Demonetisation, Increasing Decreasing, Gold Mining, Square Submatrices

November Lunchtime 2020 Division 1

Gasoline, Fractions, Circle Coloring

September Lunchtime 2020 Division 1

Permutation Split, Root the Tree, Robot Detector

February Challenge 2021 Division 1

Team Name, Prime Game, XOR Sums

March Challenge 2021 Division 1

Consecutive Adding, Paparazzi Gennady, Space Arrays

March Lunchtime 2021 Division 1

Node Codon, Uniform, Lunchtime, Gamer

April Cook-Off 2021 Division 1

Array and Operations, Tree Distances, OR of ANDs, Valet Parking, Deletion Sort

June Cook-Off 2021 Division 1

Binary String on Steroids, Battle Royale

June Lunchtime 2021 Division 1

Richie Rich

July Cook-Off 2021 Division 1

Beautiful Subsequence, Mod Equality, Hidden Colored Graph

September Cook-Off 2021 Division 1

Chess Kings Chasing Game, Chef and Pairwise Distances, Half Sequence, Fake Swaps

SnackDown 2021 - Online Qualifiers

Prefix as a Substring 2, Lucky Number, Maximum Number Of Distinct Elements, Minimise Difference

SnackDown 2021 - Online Round 1A

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

SnackDown 2021 - Online Pre-Elimination

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

SnackDown 2021 - Online Elimination Round (Rated for all)

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

SnackDown 2021 - Final Round

Ones Guessing, Equal Number of Prefix Maximums, AND of Maximums

February Lunchtime 2022 Division 1

Permutation Xor, Chef Cooks Permutation, Visit Them All, Magical Modulo, Magnet Sort

CodeChef Starters 28 Division 1 (Unrated)

Broken Dreams

May Cook-Off 2022 Division 1 (Rated)

Max Min Circle Difference, Different Subarrays Rearrange, Triple Inversions

May Lunchtime 2022 Division 1 (Rated)

Balanced 0-1 Tree, Equal After And, Rearrange Ranges

Starters 181 (Rated for all)

The Best Matrix, Tree Colouring (Hard), Flip Prefix

Total Problems Solved: 616

2551
(Div 1)
★★★★★★★
CodeChef Rating (Highest Rating 2816)
  • 67 Global Rank
  • 2 Country Rank

Badges

Contest Contender -  Diamond Badge

Contest Contender - Diamond Badge

Received for participating in 100 Contests

Problem Solver - Gold Badge

Problem Solver - Gold Badge

Received for solving 500 Problems

Daily Streak - Bronze Badge

Daily Streak - Bronze Badge

Received for maintaining a streak of 5 days

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