Yahor

Practice: 

Prefix borders, Xor Table, GCD Sum, Chef and Lost Story, The Last Droid, Save Jewels, CCDSAP Exam, Mysterious Ratio, Nested Rotation, Chefina on a Trip, Curious Queries, Kuroni and the Cowsheds, MEX-ception, Graph Labelling, A Special Tree 2

October Challenge 2017: 

Max Mex, A Balanced Contest

November Challenge 2017: 

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

December Challenge 2017: 

Chef and Universe, Total Diamonds, Chef And his Cake, Chef And Easy Xor Queries, Penalty Shoot-out, Red and blue points, Chef and Hamming Distance of arrays

December Lunchtime 2017: 

Days in Month, Strange Function, Too Much Sweetness

January Cook-Off 2018: 

Multiple of 3, Make array great again, Survive in ChocoLand

February Lunchtime 2018: 

Game with numbers, Jumping in the hills

March Challenge 2018 DIV 1: 

Pishty and Triangles, Chef and Interval Painting, Chef Cuts Tree, Chef and Easy Problem, Chef and Gcd Queries, Mix the Colors, Minions and Voting, Embedding a Tree (Challenge)

March Cook-off 2018 Division 1: 

Chef Goes to the Cinema, Chef Restores an Array, Chef Restores a Matrix

July Challenge 2018 Division 1: 

Pizza Delivery, Picking Fruit for Chefs, Tom and Jerry, Reach Equilibrium, No Minimum No Maximum, Gears

August Challenge 2018 Division 1: 

Modular GCD, Interactive Matrix

September Challenge 2018 Division 1: 

AND Square Subsegments, Selinas the Chefs Falling on the Tree, Sasha and Photos, Factorize, Table Game, Bad Shuffle

June Lunchtime 2018 Division 1: 

Sort the Leaves, Permutation Composition Queries, Summary Power

December Lunchtime 2018 Division 1: 

Choosing from Buckets, Drawing Lines, Maximize the NOSS, Age Calculator

January Challenge 2019 Division 1: 

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

January Cook-Off 2019 Division 1: 

Ada School, Ada Function, Ada Matrix

February Lunchtime 2019 Division 1: 

Roll the Bar, Families of Chefland, Create Permutation, Average Number, The Tricky Deal, Chef Challenge

Code Mutants 2019: 

Magic Rods and Bits

March Challenge 2019 Division 1: 

Chef and Soccer, Cheating on Queue, Treasure Hunt, Yet Again a Subarray Problem, Matchable Permutations

April Cook-Off 2019 Division 1: 

Doubly Increasing Path, Random Game, Pied Piper vs Hooli, Mystery Tree, Guess My Age

April Lunchtime 2019 Division 1: 

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

May Cook-Off 2019 Division 1: 

Misha and Nice Sets, Bitsetbaba and Power Grid, Expected Xor, Nearest Color, Searching for a Biclique

June Challenge 2019 Division 1: 

Lent Money, Count Arrays, Chef and Ingredients, Chef and His Dish, Intersecting Paths, Sum and GCD

July Challenge 2019 Division 1: 

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

July Cook-Off 2019 Division 1: 

Birthday Gift Again, War in Treeland Again, Minimum and Maximum, Magical Menu, Expected Product

July Lunchtime 2019 Division 1 (Unrated): 

Delete a Subarray, Professor on a Trip, Two-lane Road, Equal Median

August Challenge 2019 Division 1: 

Guddu and his Mother, Encoding, Tree Sequences, Dilemma, Maximize an Expression, Chef and Gordon Ramsay, Complement Spanning Trees

August Lunchtime 2019 Division 1: 

Beauty of Pairs, Beauty of Segments, Equal Average, Destroy Cells, Chef Does Coke Yet Again

September Challenge 2019 Division 1: 

Biladerim Icin, Fuzzy Linear Combinations, Expected GCD, Doofish Set, Power Sum, Chef Designed a Network

September Mega Cook-Off 2019 Division 1: 

Angry Grandfather, Palindromes Machine, Hiring Chefs, Fitness Exercises

September Lunchtime 2019 Division 1: 

All Substrings, Ice Cream Queue, Treeversion, Apples and Oranges, Find the Sum

October Challenge 2019 Division 1: 

Queries on Matrix, Even Edges, Bacterial Reproduction, Chef and Maximum Star Value, Array Modification, Faulty System

October Mega Cook-Off 2019 Division 1: 

D-Function, D-Value, D-Or

November Cook-Off 2019 Division 1: 

The Biggest Restaurant, Expected Number of Customers , Black-and-White Tree, The Challenge Day, Robots in Chefland

January Cook-Off 2020 Division 1 : 

Almost Palindromic, Profitable Paths, Count It, Range AND, Chefina and Sums

February Cook-Off 2020 Division 1: 

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

March Cook-Off 2020 Division 1 : 

Mysterious Sequence, A Tree to Remember, Maximize Letter Beauty, Random Chocolates, Escape the Tree

May Cook-Off 2020 Division 1: 

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

January Lunchtime 2020 Division 1: 

Minimum and Maximum, Construct Array, Under the Tunnels, Folding Paper

February Lunchtime 2020 Division 1: 

Coronavirus, Painter Problem, Swapping to Palindrome, Monsters Battle, Secret Mission

March Lunchtime 2020 Division 1 (Unrated): 

Maximize LCM, Strip in a Tree!, Chef and Secret Recipe

May Lunchtime 2020 Division 1: 

GCD of the Submasks, Absolute Min Max, Escape One, Convert the String, Tree difference

ENIGMA - PLINTH'20 LNMIIT (Rated for all): 

Cumulative Palindrome Count, Banana String, Corruption in Freedonia, Gru is Handing Out Bananas, Gru and his Robbery of Mars, Minion AND Range, Is it Sorted or Not, That is the Question, Recruit Villagers

July Cook-Off 2020 Division 1: 

What Is This, a Crossover Episode, The In-XOR-able Task, Even-tual Reduction, OR-thodox Distinction, Path-etic Products, Chef and Modular Sequence

July Lunchtime 2020 Division 1: 

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

June Lunchtime 2020 Division 1: 

Maximum AND, Gold Mining, Square Submatrices

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, Village Road Network

December Challenge 2020 Division 1: 

Hail XOR, Square Root of LCA Convolution, Calculus, Linear Combination, Permutations, Digit Matrix, String Operations, Palindromic Equivalence, Positive Prefixes, Even Pair Sum

Coders' Legacy (Rated for all): 

Chef vs Doof, Doof on Cartesian, Doof fires Brackets, Jeremy gets a gift, Perry learns Binary, Unique Substring

September Cook-Off 2020 Division 1 : 

Joined Subarrays on Tree, Balancing Game, Maximise Subsequence Value, Minimum Insertions, Graph Labelling

July Cook-Off 2021 Division 1: 

Beautiful Subsequence, Mod Equality, Hidden Colored Graph, Make the Matrix Beautiful

August Cook-Off 2021 Division 1: 

Odd Array, Different String, Maximum Tree Jumps, Chef 2 Chef, Interactive Equivalency, Clear the Array

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