Trung Nguyen

August Challenge 2015

Way Out, Gravity Guy, Devu And Churu , Cooking Machine, Aditi and Magic Trick, Chef and insomnia

December Challenge 2015

Sereja and Dividing, Chef and cinema, Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Misha and Permutation, Chef and Filters, Chef and Girls, Trip and Palindromes, Tanks

July Lunchtime 2015

Greedy puppy

December Lunchtime 2015

Ancient Berland Roads, Distinct Codes

January Long Challenge 2016

Sereja and Salesman, Chef and Inflation, Rupsa and the Game, Churu and Balls, Chef and Making Triples, Asteroids, Cyclist Race, Dai Ma Chu Shi, Chef and Time Machine, Devu and Perfume

February Challenge 2016

Chef and Job and Rest, Sereja and Two Lines, Chef and Strange Operations, Devu and a light discussion, Weird Sum, Rectangles of Love, Chef-Detective, Matrix Maximum Sum, Sereja and Permutations, Call Center Schedule

March Challenge 2016

Sereja and Two Strings 2, Polygon & Circles, Chef And Hungry Birds, Palindromic substrings, Floor Distribution, Chef and Number Guessing, maximize the sum, Parity tree, Chef And Special Dishes, Tiptoe through the tulips

April Challenge 2016

Amazing Experiment, Mario and Luigi, Help Watson Escape, Fibonacci Queries, Chef and Big Matrix, Chef and Ballons, Devu and good strings, Chef And Magical Path, Chef And Coloring, Game of snakes on a grid

May Challenge 2016

Sereja and GCD 2, Easy Queries, Chef and math, Chef and Balls, Forest Gathering, Chef and Amazingness of Numbers, Optimal Shopping II, Chef and Big Soccer, Laddu, Roads in Stars

June Challenge 2016

Chef And The Hiring Event, Chef and Rectangle Array, Chef and New Game, Chef and Array and K, Chef And Binary Operation, Chef and Coins Game, Chef and cities, Misha and Geometry, Devu and an Array, Chef and Sad Pairs

July Challenge 2016

Andrash and Stipendium, Chef and Segments, Chef and Tetris, Chef and special numbers, Evaluate the polynomial, Chef and Robots Competition, Chefland and Electricity, Chef and Polyhedron, Defend the Recipe, Scheduling jobs on a cluster

August Challenge 2016

Chef and His Garden, Fighting Ebola, Chef and Circle Run, Chef and Chocolate, Chef and Round Run, Funny gnomes, Maximum Grid, Chef and Guard Towers, Chef and Tree, A Good Problem

September Challenge 2016

Chef and Friends, Dividing Machine, Chef and Matrix Division, Chef and digits of a number, Faded Palindromes, The New Restaurant, JosephLand, Chef and calculation, Chef and Cut

October Challenge 2016

Sereja and Progressions, Sereja and Stones, Chef and Keyboard, Big Queries, Fenwick Iterations, Chef and Three Dogs, Power Sums, Chef and Two String, Tree Balancing, Bear and Shuffled Points

November Challenge 2016

Count Permutations, Friends Meeting, Urban Development, Gift and Chef, Kirito in Memeland, Chef and squares, Chef and Bike, Sereja and Permutations 3, Sereja and Ways in the Cube, Task for Alexey

January Cook-Off 2016

Chef and Destruction, Chef And Fibonacci Tree, Chef and Fruits

April Cook-Off 2016

Movie Weekend, Odd Divisors, Queries on a Binary Tree

May Cook-Off 2016

Phantasialand, Easy Numbers

August Cook-Off 2016

Tweedle-Dee and Tweedle-Dum , Math Hatter

September Cook-Off 2016

Lazy Jem, The Lost Arithmetic Sequences, Counting Strings, Find The Point

October Cook-Off 2016

Sherlock and the Ugly Flower, Watson asks Does Permutation Exist, Sherlock Counts Ways, ChefWatson uses Social Network, Sherlock and Smallest Window

November Cook-Off 2016

Sebi and the cube, Sebi and the highway, Sebi and the black money, Sebi and the corrupt goverment

January Lunchtime 2016

Exponential Sub-Palindromes, Triangle Classification

February Lunchtime 2016

Chef and Socks, Chef and Tic-Tac-Toe

June Lunchtime 2016

Collisions, One more weird game, Square in numbers, Travelling in a tree

August Lunchtime 2016

Studying Alphabet, Short in Average, Product of Diameters, Lock-Free Stack

October Lunchtime 2016

Restore the Permutation, FastFood Combos, The Largest Bouquet

November Lunchtime 2016

Chef and his Students, Chef and Square Set, Chef and Balanced Polygons, Tom & Jerry

December Lunchtime 2016

Superheroes and villains, Fly height mode, Subtree swapping

January Challenge 2017

Capital Movement, Cats and Dogs, Sereja and Circles, Sereja and BOX, Coprime 6-tuples, Chef and Circle, Fantastic Four, Digits Cannot Separate, Reservior, Tourists in Mancunia

February Challenge 2017

Chef and Yoda, Primitive Queries, Interval Game, Sereja and Inversions, Rebel rescue, Chef and Triangles, Chef and His Apartment Dues, Most Frequent Element, Gerrymander, Alice and her garden

March Challenge 2017

Cooking Schedule, Completing favorite game, Sum of distances, Path Triples On Tree, Xenny and Alternating Tasks, Pishty and birthday, Bear and Extra Number, Bear and Cat Trap, (CH) Bear and Sorted Rows, Bandwidth of a matrix

January Cook-Off 2017

Digit Longest Increasing Subsequences, Matrix Transformation, Digit Longest Increasing Subsequences 2

February Cook-Off 2017

Download file, To add or to multiply game, Mixing flavors, Chairs, Cooking Game

January Lunchtime 2017

Sealing up, Nothing in Common, Segment Queries

April Challenge 2017

Chef and Digits, (CH) Serejs and Billiards, Bear and Random Grid, Chef and Divisor Tree, Stable market, Heavy-Light Decomposition, Dish Of Life, Bear and Row 01, Bear and Clique Distances, Similar Dishes

May Challenge 2017

Chef and Sub Array , Long Sandwich , Gotham PD, Chef and his daily routine, Courses in an university, Blocked websites, Median of adjacent maximum numbers, Chef and Subsequences, Chef and Battleship, Painting Tree

June Challenge 2017

Persistent oak, Chef and Prime Queries, Saboteur (Challenge), Euler Sum, A Good Set, Cloning, Chef and the Feast, Xenny and Coin Rankings, Triplets, Pairwise union of sets

September Challenge 2017

Sereja and Commands, Sereja and Functions (Challenge), Chef and Pick Digit, Minimum Good Permutation, Sum of Cubes, Querying on a Grid, Weasel does Xor on Tree, Weasel finds Staircase, Fill The Matrix, Little Chef and Sums

October Challenge 2017

Chef and Magic Arrays, Chef and a great voluntary Program, Chef and Cycled Cycles, Shooting on the array, Max Mex, Chef and Horcrux, Counter Test For CHEFSUM, A Balanced Contest, (Challenge) Connecting computers, Lucky Edge

December Challenge 2017

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

March Cook-Off 2017

Rainbow Graph, Meeting location, Yet Another Card Game, Increasing Xor Sequence, Safe Robot

May Cook-Off 2017

La Liga, Balanced Array, Hussain Set, Nasty Queries

June Cook-Off 2017

Ada and crayons, Knight Covering, SnackUp, Centeroid

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

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

September Cook-Off 2017

Numbers Game, Infinite OR Game, Statistics Construction, Subsequence Equality

March Lunchtime 2017

Bear and Haircut, Bear and Ladder, Bear and Species

April Lunchtime 2017

Bear and Digit Virus, Bear and Segments, Closest points queries, Bear and Segment 01

May Lunchtime 2017

Prefix Inversions

June Lunchtime 2017

Maximum Unique Segment, Two Numbers, Company and Club Hierarchies

July Lunchtime 2017

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

September Lunchtime 2017

Chef and Dice, Chef and Cook-Off Contests, Chef and Programming Contest by His Friend

December Lunchtime 2017

Days in Month, Strange Function, Too Much Sweetness, Four Friends

January Cook-Off 2018

Multiple of 3, Make array great again, Finding the matrix, Survive in ChocoLand

January Lunchtime 2018

Chef and Game with Sequence, Chef and Average on a Tree, Chef and Function, Chef and Escaping from the Labyrinth

February Cook-Off 2018

Chef and Cook-Off, Chef and Tuples, Chef and Chefness, Chef and Line, Chef and Chefcoin

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)

July Cook-Off 2020 Division 1

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

SnackDown 2021 - Online Qualifiers

Lucky Number

SnackDown 2021 - Online Round 1A

Round Robin Ranks , Dance Moves, Min Max LCM

SnackDown 2021 - Online Round 1B

Queens Placement , Largest Laddu, Help Nishant

November Lunchtime 2021 Division 1

Min-Fund Country, Min-Max Rotations, Permutation Pairs, Subarray Jumps

SnackDown 2021 - Elimination Parallel (Rated for Div 1)

Random Convex Hull, Graduate Work Matters, Sorting Segments

January Cook-Off 2022 Division 1

Subsegment Divisibility , Merged LIS, Boring Trip, Prime Graph, Erase All But One

January Lunchtime 2022 Division 1

Permutation XOR Sum

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