Benjamin Qi

Practice: 

Discrepancies in the Voters List, Genetics, Communicating Servers, Card Shuffle, Substrings on a Tree, Andrew and the Balls, Random Number Generator, A game on a graph, Counting on a directed graph, Chain of Doughnuts, Count Steps in Matrix, Chef and Bitwise OR Operation, Evaluate the polynomial, Short in Average, Product of Diameters, Euler Sum, Hussain Set, Chef and Pairs, Add or Multiply, Mex division, Black Nodes in Subgraphs, Product on the segment by modulo , Optimal Subset, The Prestige, Chef at the River, A Family of Bipartite Graphs, Fighting Armies, Magic School, Is it a Cakewalk Problem, Martingale, D - Balanced Parenthesis Substrings, Alohomora, Alien Invasion, Reforms, Reforms Never Change, Sauna Cred, The Most Amazing Dish, Zawad and Index Sum, Nearest Color, XOR Magic, Intervals and Intersections, The Secret Recipe, War in Treeland Again, Minimum and Maximum, Expected Product, Beautiful Pairs, CCDSAP Exam, Good Subsequences, Painter Problem, Chef and Rainbow Road, Prefix Suffix LIS Counting, Prefix Suffix LIS Constructing, Tree and Brilliant Array, The Strange Ranking of Sport Climbing, Queue at the Bakery, Beautiful Permutation, Mex Pairs, Permutation Xor, K0KALARU47 and CP task, Odd Split, Median Pairs, Minimum Xor On Segment, SPLIT With XOR Not X, Alice Potter and Wingardium Leviosa

August Challenge 2016: 

Fighting Ebola, Chef and Circle Run, Chef and Chocolate, Chef and Round Run, Funny gnomes, Maximum Grid, Chef and His Garden

August Lunchtime 2016: 

Studying Alphabet, Lock-Free Stack

Past ZCO Problems: 

Bookshelves, Variation, Smart Phone, SUPW, Video Game, Tournament, Round Table, Wormholes, Matched Brackets, Chewing

Past INOI Problems: 

Table Sum, Periodic Strings

May Cook-Off 2017: 

La Liga, Balanced Array, Nasty Queries

June Cook-Off 2017: 

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

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

August Cook-Off 2017: 

From heaven to earth, Game on Stick, Real obtuse, Tree Connectivity, Matrix and Chef

July Lunchtime 2017: 

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

October Lunchtime 2017: 

Weird Competition, Buggy Calculator, Maximum Number

SnackDown 2021 - Online Qualifiers: 

Minimise Difference, Prefix as a Substring 2

SnackDown 2021 - Online Round 1A: 

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

SnackDown 2021 - Online Pre-Elimination: 

Non-Decreasing Subsequence of size K, Guess the row, Mega mu - 2, Mega mu - 1, Guests like slippers, Product Pain, Good ranking

SnackDown 2021 - Online Elimination Round (Rated for all): 

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

SnackDown 2021 - Final Round: 

Ones Guessing, Scrupulous Robbery Plan, Equal Number of Prefix Maximums, Finally, Non Ad-Hoc Problem, AND of Maximums

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