Kim Song Bok

Practice: 

Little Elephant and T-Shirts, Substrings and Repetitions, Chef and medium problem , Rupsa and the Game, Chef and Bitwise OR Operation, Bipartite Graph from Trees, Chef and Dancing Steps, Skiing, Rotate Point, Before Having Donuts, (Challenge) Delete DAG, Chef and Working Plan, (Challenge) Interleaving Strings, The Last Droid, Intervals and Intersections, Abdullah and Toll Discounts, Magic Permutations, Warriors, Rich Substrings, Friends and Candies, Two Circles, Equal Average, Stick and polygon, The Evil Professor, Frequency Function, Guess the number, Easy Geo xD, Precise Pairing, Maximum AND, Gold Mining

December Challenge 2018 Division 1: 

Before Having Donuts, (Challenge) Delete DAG, Colorblind Feast, Max and Electrical Panel, Directing Edges, Edge Addition, Chef and Interactive XOR, Chef and Working Plan

November Challenge 2018 Division 1: 

Chef and Recipes, Chef and Equations, Max-digit Tree, Appy Loves One, Good Median, Chef, Primes and Trees (Challenge), Magician versus Chef 2, Binary Strings

October Challenge 2018 Division 2: 

Walk on Tree, Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Coprime Components, Chef and Serves, Byte to Bit, Chef and Circles, Distinct Rows in Submatrices

September Lunchtime 2018 Division 2: 

Judging Delay, Biased Judgement, Opposite Cites, Chef Restaurant , Match the Streams

November Lunchtime 2018 Division 1: 

Useful Number, Median, Maximize It, Probability, Beats and Pieces

Cypher September: 

Abhishek and ASCII, Happy Or Sad, Find the Farthest City

January Challenge 2019 Division 1: 

Yet Another Problem About Sequences, Different Neighbours, Partition the Graph, Distinct Pairs, Maximum Distance, Party, (Challenge) Chef and Matching Game, A Pizza Slice

February Challenge 2019 Division 1: 

Manhattan Rectangle, Guess It Right, Chef and Secret Ingredients, Xor Decomposition, Yet Another Tree Problem, (Challenge) Chef with Orchestra in the Kitchen, Art of Balance, Maximize the Tax

April Lunchtime 2019 Division 1: 

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

October Challenge 2019 Division 1: 

Queries on Matrix, Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Array Modification, (Challenge) Maximizing LIS, Faulty System

May Challenge 2020 Division 1: 

Buying a New String, Triple Sort, Binary Land, Sorting Vases, Not a Real World Problem, Chef and Rainbow Road, Chef and Bitwise Product, (Challenge) Nanobots, Precise Pairing, Precise Bipartite Pairing

July Challenge 2020 Division 1: 

LCM Constraints, Chefina and Swaps, Easy Geo xD, Chef and Dragon Dens, Missing a Point, Doctor Chef, Weird Product, Expected Repetitions, Expected Spanning Trees, (Challenge) Dynamic Hull

August Challenge 2020 Division 1: 

Insanely Hard School Exams, Subsequence Frequency Counting, Precious Stones , Chefina and Strange Tree, Smallest KMP, Ants (Challenge) , Chef Thanos Wants Perfect Balance, Chef and Wedding Arrangements

November Challenge 2020 Division 1: 

Panic! at the Disco, Chef and the Combination Lock, Connect on a Grid (Challenge), Restore Sequence, Magical Candy Store, Selecting Edges, Red-Black Boolean Expression, Scalar Product Tree, Unusual Queries

July Challenge 2021 Division 1 (Unrated): 

XxOoRr, Chef vs Bharat, Even Odd Partition, Optimal Denomination, Chef and Pairs, Madoka and Ladder Decomposition, Dakimakura Distribition, K Path Query

August Challenge 2021 Division 1 (Unrated): 

Special Triplets, Array Filling, Geometry 1, Chef and Bulb Invention, Alternating LG Queries, Charge Scheduling, Chef and Digits of Large Numbers, Fat Hut, Problem Difficulties, Olympics Ranking

September Challenge 2021 Division 1 (Unrated): 

XOR Equal, Shuffling Parities, Minimize Digit Sum, Treasure Hunt, 2-D Point Meeting, Airline Restrictions, Travel Pass, Covaxin vs Covishield, Minimum Digit Sum 2

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