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Practice: 

Xor it, Arithmetic Progressions, Final Battle of Chef, Counting The Important Pairs, Sereja and Commands, Prime Distance On Tree, Chef and Favourite Sequence, Sereja and Two Arrays, Chef and Graph Queries, Chef and Swaps, Children Trips, Chef and Churu, Sereja and Salesman, Ingredients, Dividing Machine, Computer Network, Sereja and Pairs, Product on Tree, Tree Coloring, Cooking Schedule, Chef Land, Maximum Grid, Fluffy and Alternating Subsequence, Stable market, Bear and Xor of Sums, Closest points queries, Cloning, Ancestors in Two Trees, Travel to all Points, Divide the Set, Querying on a Grid, Weasel does Xor on Tree, Fill The Matrix, Killing Monsters, A humongous Query, L-R queries, Chef And Easy Xor Queries, Queries with GCD, Pishty and Triangles, Chef and Average on a Tree, Chef and odd queries, Chef and Gcd Queries, Chef and Chefness, Computer Virus, Darts, Dibs on Fibs, Sonya and Segments, Batman and Tree, Unusual Sorting, Sort the Leaves, No Minimum No Maximum, Finding Second Maximum, Chef and Queries on a Tree, Chef and GCD Game , GCD Sum, Standard Tree Task, OneTwo, Learning Dishes, Make a Permutation, Opposite Cites, Chef Restaurant , Coin Partition, Pumping Water, (Challenge) Delete DAG, Useful Number, Median, Adi and the Tree, Partition the Graph, Adjacent Leaves , Count Subsequences, Distinct Pairs, Party, Xor Decomposition, Families of Chefland, Chef Challenge, Music Shopping, Random Game, Bitsetbaba and Power Grid, Expected Xor, Nearest Color, Counting Inversions Again!, XOR Equal, Array Filling, Shuffling Parities, Minimize Digit Sum, Treasure Hunt, 2-D Point Meeting, Airline Restrictions, Travel Pass, Minimum Digit Sum 2

March Challenge 2018 DIV 2: 

Chef and Easy Problem, Pishty and Triangles, Minion Chef and Bananas, Minions and Voting, Mix the Colors, A Big Sale, Chef and Glove

April Challenge 2018 Division 2: 

Cutting Plants, Weight of Numbers, Highway Crossing, Count Good Prefixes, Average of Pairs, Workers

August Challenge 2018 Division 2: 

Spell Bob, Sheokand and Number, Lonely Cycles, Problem Sort, Modular GCD, Coordinate Compression , Princess and Dragons

September Challenge 2018 Division 1: 

War of XORs, Bad Shuffle, Table Game, Chef and Adventures, Factorize, Chef and Condition Zero (Challenge), Chef and Lost Story, Magician versus Chef, Sasha and Photos, Selinas the Chefs Falling on the Tree, AND Square Subsegments

December Challenge 2018 Division 1: 

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

October Challenge 2018 Division 1: 

Walk on Tree, Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, (Challenge) Chef and Takonemo, Coprime Components, Distinct Rows in Submatrices

March Challenge 2019 Division 1: 

Yet Again a Subarray Problem, (Challenge) Interleaving Strings, Matchable Permutations, Treasure Hunt, Sonya and Tree, Cheating on Queue, Chef and Soccer, Perfect Tree Problem

April Challenge 2019 Division 1: 

Maximum Remaining, Sonya and Queries, Moving Rectangles (Challenge), Edgy, Fencing, Subtree Removal, Friend or Girlfriend, Playing with Numbers, Mininum XOR over Tree, Kira Loves Palindromes, Offer for Chef

April Long One 2022 Division 1 (Unrated): 

Dazzling AXNODR Challenge , Pairwise Xors

January Long 2023 Division 1 (Unrated): 

Minimize the Maximum

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