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Practice: 

Odd Binomial Coefficients, First non-Palindrome, Music & Lyrics, Counting The Important Pairs, Prime Distance On Tree, Chef and Graph Queries, Updating Edges on Trees, Covering Sets, Factorial to Square, Dividing into Regions, Weird Queries, Sticks, Good Pairs, Vertex Cover, Longest Constrained Subsequence, Archi and Tree, CyclesAndColorings, Chef and Queries on a Tree, MEX and Ranges, Count Subsequences, Xor Decomposition, Expected GCD, Cumulative Palindrome Count, Almost Palindromic, Joined Subarrays on Tree, Coronavirus, Chef and Array, Chef and Rainbow Road, Profitable Paths 2, Dot Time, Xor Jar Muluk Tar, Curious Queries, GCD of the Submasks, Golomb Sequence, Coloured Pairings, Pairs of Pairs, Chef and Sums, Move the Coins - Creating Tests, Counting Graphs, Balancing Game, Mysterious Sequence, Bunny Hops, Just a Graph, Longest Spanning Substrings, Chef and Deque

December Cook-Off 2018 Division 2: 

Camp Or Not

September Challenge 2018 Division 2: 

Magician versus Chef, War of XORs, Chef and Adventures

November Challenge 2018 Division 2: 

Chef and Difficult Contests, Chef and Happiness

November Challenge 2019 Division 2: 

Hard Sequence, Weapon Value

March Challenge 2020 Division 2: 

Chef and DAG, XOR Engine, Ada Bishop 2, Winning Ways 2, Lasers Everywhere, Lasers Everywhere Alternative, Pintu and Fruits

April Challenge 2020 Division 1: 

Strange Number, Squared Subsequences, Perfect Power Divisors, Ready Bitwise, Factor Tree, Leaked Answers (Challenge)

May Challenge 2020 Division 1: 

Buying a New String, Triple Sort, Binary Land, Sorting Vases, Chef and Bitwise Product

April Cook-Off 2020 Division 1 : 

Tower Counting, Simple Operations, Inversions in Permutations

May Cook-Off 2020 Division 1: 

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

January Lunchtime 2020 Division 2: 

Construct Array, Bob and His Friends, Chef and Street Food, Under the Tunnels

April Lunchtime 2020 Division 1: 

Triangle Query, Positive Mex

May Lunchtime 2020 Division 1: 

Absolute Min Max, Escape One, Convert the String, Tree difference

July Challenge 2020 Division 1: 

LCM Constraints, Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef, Expected Repetitions

August Challenge 2020 Division 1: 

Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements

September Challenge 2020 Division 1: 

Chefina and Swap, Chef and Trump Cards, Find XOR, Rotate the Polyline, Ada Matrix

July Cook-Off 2020 Division 1: 

The In-XOR-able Task, Even-tual Reduction, OR-thodox Distinction, Path-etic Products

July Lunchtime 2020 Division 1: 

Binary Concatenation

June Cook-Off 2020 Division 1: 

Per Capita Income, Carry Bed, Checkpoints, Banned Quotient, Drawing

June Lunchtime 2020 Division 1: 

Maximum AND, Kuroni and the Cowsheds, Gold Mining, Square Submatrices

RECode 12.0 (Rated for all): 

Chef and String, Chef and Walk, Chef and Rotation, Chef and Or, Chef and Subsequences, Chef and Numbers

October Challenge 2020 Division 1: 

Positive AND, Replace for X, D-Dimensional MST, Compress all Subsegments, Adding Squares

November Challenge 2020 Division 1: 

Chef and the Combination Lock, Restore Sequence, Magical Candy Store, Scalar Product Tree, Unusual Queries

January Challenge 2021 Division 1: 

Cool Subsets, Chef and Ants, Guess the Tiling, Expected Number of SCCs, Blackjack, Sequence Creation

December Cook-Off 2020 Division 1 : 

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

December Lunchtime 2020 Division 1 (Unrated): 

Even Sequence, Three Letters, One Zero Swaps

January Lunchtime 2021 Division 1 (Unrated): 

Good Grid, Dreams of Divisibility, Even Sum

October Cook-Off 2020 Division 1: 

Path-etic Sums, An Inveractive Problem, Yet Another Crossover Episode

November Cook-Off 2020 Division 1: 

Flip the String, Chef and IPC Certificates, Graph Construction, Set Queries, Hiring Workers

October Lunchtime 2020 Division 1: 

Chef Likes Good Sequences, Chef Is Just Throwing Random Words, Counting Spaghetti, Cute Chef Gift

November Lunchtime 2020 Division 1: 

Gasoline, Rook Path, Fractions

CodeJunk: 

Zaikia and sticks, The king of snakes, Uttu at war with Gangwar, Ladki ka chakkar Babu Bhaiya

Coders' Legacy (Rated for all): 

Chef vs Doof, Doof on Cartesian, Doof fires Brackets, Jeremy gets a gift

September Cook-Off 2020 Division 1 : 

Maximise Subsequence Value, Minimum Insertions

September Lunchtime 2020 Division 1: 

Root the Tree, Robot Detector

UWCOI 2021 (Rated for all): 

Organisation, Array Swaps, Efficient Delivery, Hidden Numbers, Binary Puzzle

February Lunchtime 2021 Division 1: 

Average Sorting, Sed Max, Chef and Reordering, Independent Set

April Challenge 2021 Division 1: 

Binary String MEX, Tree Permutations, Worthy Matrix, Destroy the EMP Chip, Chef and Pair Flips, Chef and Dice, Boolean Game

July Cook-Off 2021 Division 1: 

Beautiful Subsequence, Mod Equality, Hidden Colored Graph

July Lunchtime 2021 Division 1: 

Xor Separation, Longest Good Segment

August Cook-Off 2021 Division 1: 

Odd Array, Different String, Chef 2 Chef, Interactive Equivalency, Clear the Array

September Cook-Off 2021 Division 1: 

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

September Lunchtime 2021 Division 1: 

Interesting Representation, Alice vs Bob Faceoff

April Lunchtime 2022 Division 1(Rated): 

Modular Circular Permutations, Do Not Touch the MEX!!!, Secret Machine Mania, AND Palindromes

June Cook-Off 2022 Division 1 (Rated): 

Throw and Take, Simple XOR, Prefix Suffix Distinct, Split AND Sum

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