Jakub Safin

December Cook-Off 2012

Expected Greatest Common Divisor, Packaging Cupcakes, Reversing directions

January Challenge 2013

Little Elephant and Alcohol, The Minimum Number Of Moves, End Of The World, Chef of the Year, Three Different Numbers

January Cook-Off 2013

Minimum Distance, Many Chefs

February 2013 Challenge

Little Elephant and Cards, Buy1-Get1, Climbing Stairs

March Challenge 2013

Random decreasing function, Tourist Translations, Approximately, Fire Escape Routes

March Cook-off 2013

The Ball And Cups, Palindrome

April Challenge 2013

Little Elephant and Music, Barcelona Gameplay Tactics, Maximum Weight Difference, Levy Conjecture

April Cook-Off 2013

Andrew and the Meatballs, Andrew and the Strings, Andrew and the Meatballs again

May Challenge 2013

Matchsticks, Witua and Math, Name Reduction, Your Name is Mine, Field Trip

June Challenge 2013

Little Elephant and Mouses, Collecting Magical Berries, Dessert Wizard, Predictopus, W String, Lapindromes

Lunch Time June 2013

Number of Factors

August Challenge 2013

Little Elephant and Lemonade, Music & Lyrics, Hello Hello, Save The Princess, The Number Of Solutions, Chef and Segments, Sereja and Ballons, Splitting Candies

August Cook-Off 2013

Chef and The Right Triangles, Chef and The Divisibility Queries, Chef and The String of Digits

September Challenge 2013

Little Elephant and Exams, Merciless Chef, Cool Guys, Chef and Integers , Project Spoon, CAO Stage-1, CAO Stage-2

September Cook-Off 2013

Strange Matrix, Game, Code

October Challenge 2013

Little Elephant and Bamboo, Helping Lira, Maxim and Dividers, Sereja and Transformation, CAO Stage-3, Yet Another Nice Girl

November Challenge 2013

Chef Game, Superpowers of 2, Gangsters of Treeland, Yet Another Cute Girl, Uncle Johny, Square Digit Squares, Missing some chairs

December Challenge 2013

Lucy and the Flowers, Cube Cakes, Chef and Codes, Funny Marbles, Magic Pairs, Reign, Rectangular Queries, Query on a tree VI

December Cook-off 2013

Chef Goes Through Segments, Chef and Girlfriend, Chef and Combinatorics

January Challenge 2014

Magic Trick, Counting The Important Pairs, Sereja and Graph, Counting D-sets, ForbiddenSum, Meteor, Bon Appetit, Please like me, Chef and Feedback

March Cook-Off 2014

Game of Divisors, ABC-Strings, Dividing Stamps

April Cook-Off 2014

Snape and Ladder, BiCo Gaming Grid, Travelling Chef Problem

May Cook-Off 2014

Book Game with Chef, Divide the Cake, Ups and Downs

July Cook-Off 2014

Copy-Paste, Present for Andrii, Sum Queries, Tree Again, Friends

August Cook-Off 2014

Tree Game, Permutation Shuffle, Shooting

September Cook-Off 2014, ACM-ICPC Warm up

Sherlock and the Grid, Subarray GCD, Subarray LCM, World War 2

November Cook-Off 2014

Lost Graph, Most Distant Points, Brackets, Petersen Graph

December Cook-Off 2014

Servers, Jam, Matrix Again, Player, Good Joke!

March Challenge 2014

Team Split, Binary Tournament, Walk, Maximum number, GCD condition, The Street , Little Chef and Numbers, Mike and Stamps, A Story with Strings, Chef and Graph Queries

April Challenge 2014

Final Battle of Chef, Counting Matrices, Farmer Feb, Cards, bags and coins, Chef and Digits, Divide the Tangerine, Chef and Tree Game, Shortest Path in Binary Trees

May Challenge 2014

Little Elephant and Balloons, Sereja and Game, Compilers and Parsers, Chef-jumping, Fun with AGp, Chef and Strange Matrix, Stone

June Challenge 2014

Little Elephant and Blocks, Maxim and Progressions, Chef and Functions, Chef and Digit Jumps, Chef and Subarray, Sereja and Arcs, Two Companies, Guessing Game, Forgot Password

July Challenge 2014

Little Elephant and Painting, Garden Game, Chef and Frogs, Sereja and Equality, Chef and Rectangle Genome, Count Substrings, Reach The Point, Dish Owner, Lucky Game, Game of Numbers

August Challenge 2014

Mountain Holidays 2, Little Elephant and T-Shirts, Chef and Reversing, Team Sigma and Fibonacci, The Leaking Robot, Earthquake, Cleaning Tables, Chef and Gift

September Challenge 2014

Sereja and Bubble Sort, Chef and Rainbow Array - 2, Chef and Swaps, Chef and Left-Right, Chef and sequence, Rectangle Query, Fun with Rotation, Flooring

October Challenge 2014

Remy paints the fence, Sereja and two strings, Chef and Ground, Chef and Square, Children Trips, Stringology is Magic, Magical Girl and Colored Liquid Potions, DevuLand, Dinosaurs and Laddus

December Challenge 2014

Chef Under Pressure, Alok-nath and His Sanskars, Chef and Bracket-Pairs, Divide or die, XOR with Subset, Chef and Apple Trees, Sereja and GCD, Good galaxy

January Lunchtime 2014

Chef and Numbers, Chef and Way

February Lunchtime 2014

Sereja and ASum, Sereja and Arrays

November Lunchtime 2014

A wolf, a sheep and cabbage, Deja Vu, Yet another substring problem, Dividing the Students

January Challenge 2015

Queries on the String, Sereja and Number Division 2, Chef and A Large Permutation, Sereja and LCM, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Ranka, Gcd Queries

January Cook-Off 2015

Suraj goes shopping, Tojo hates probabilities, Random Rudreshwar, Abhijeet and rectangles

February Challenge 2015

Chef and Chain, Time to Study Graphs with Chef, Chef and Strange Formula, Chef and Strings, Let us play with rank list, Xor Matrix, Jigsaw Puzzle Solving, Chef and Equality, Devu and Locks

March Challenge 2015

Count Substrings, Chef and Notebooks, Chef and Problems, Sereja and Random Array, Devu and his Class, Sign Wave, Matrix, Counting on a Tree

May Challenge 2015

Devu and his three Hands, Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Balanced Strings, Chef and Cake, Special Economic Zone

June Challenge 2015

Sereja and Matrix Division, Steady tables, Chef and His Friend, Chef and Memory Limit, Chef and Polygons, Anticommutative implication, Chef and String, Connect Points

August Challenge 2015

Way Out, Social Cluster, Gravity Guy, Devu And Churu , Cooking Machine, Aditi and Magic Trick, Chef and insomnia, Future of draughts, Chef and Path

October Challenge 2015

Time measure, Count Subarrays, Who dares to be a millionaire, Spheres, Cyclic shifts in permutation, Rupsa and Equilateral Triangle, Misha and Gym, LCM equation, Jump mission, Efficient Delivery

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

March Cook-Off 2015

How to Minimize a String, How to Write a Message, How to Repaint a Fence

April Cook-Off 2015

Lucky Fives, Special Agents, Equality, Version Control System

June Cook-Off 2015

Ankit, Srijan and a game of stone piles, VS and his marking scheme, Longest non regular parentheses sub-sequence, Strange operations

July Cook-Off 2015

Cops and the Thief Devu, Maximize Disjoint Pair Sum, Path containing K Nodes, Adding Special Sum

August Cook-Off 2015

Chef and the XORed Number , Chef and the Number Sequence, Chef and the Wildcard Matching

September Mega Cook-Off 2015

Reign 2, Forgotten Language, Super Numbers, Stacks

October Cook-Off 2015

Palindrome Pairs, Factorial to Square, Word Stem, Almost Sorted Permutation

November Cook-Off 2015

Sereja and Line, Sereja and Array and Subtracting, Sereja and Pairs, Sereja and Tree 2

December Cook-Off 2015

Chef and Subarrays, Chef and Queries, Chef and LCS

February Lunchtime 2015

Lucky Four, The Warehouse, The First Cube

October Lunchtime 2015

emitL, Fast squarer

December Lunchtime 2015

Computer Network, 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, Chef and Big Soccer, Laddu, Roads in Stars

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

January Cook-Off 2016

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

February Cook-Off 2016

Puppy and Palindromes, Puppy and Catchers, Puppy and Board, Puppy and Sum

April Cook-Off 2016

Movie Weekend, Odd Divisors, Queries on a Binary Tree

July Cook-Off 2016

Chef and Proportion, Chef and Numbers, Chef and Land, Chef and Array, Chef and Sort

August Cook-Off 2016

Tweedle-Dee and Tweedle-Dum , Math Hatter, Mock Turtle, Queen of Hearts

February Lunchtime 2016

Chef and Socks, Chef and Tic-Tac-Toe, Chef and Polygons, Chef and Dominating Subarrays

March Lunchtime 2016

Two Closest, Arrays Sum, Simple Statistics, ABABAABA

April Lunchtime 2016

Maximum K Sums, Tree Labelling, Coins And Triangle

June Lunchtime 2016

Collisions, One more weird game, Square in numbers

July Lunchtime 2016

Will and Closed Set, Drumpf for President!, Lumpy - The Bus Driver, So Close Yet So Far

January Cook-Off 2017

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

October Challenge 2017

Max Mex

May Cook-Off 2017

La Liga, Balanced Array, Hussain Set, Nasty Queries

June Cook-Off 2017

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

Starters 113 Division 1 (Rated)

Count Distinct Arrays, Counting Is Fun, Minimise Maximum Subarray Sum, Make All Equal, Score Sum, Maximum Score

Problems Authored (8)

Problems Tested (0)

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Editorials Contributed (38)