August Challenge 2015
Aditi and Magic Trick, Way Out
October Challenge 2015
Who dares to be a millionaire, Spheres, Rupsa and Equilateral Triangle, Time measure
October Cook-Off 2015
Word Stem, Almost Sorted Permutation
February Challenge 2016
Chef and Strange Operations, Chef-Detective
March Challenge 2016
Palindromic substrings, maximize the sum
May Challenge 2016
Chef and Big Soccer, Laddu
August Challenge 2016
Chef and Chocolate, Maximum Grid, Funny gnomes, Chef and Round Run
September Challenge 2016
Chef and Friends, Dividing Machine, Chef and digits of a number, Faded Palindromes, Chef and calculation
October Challenge 2016
Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
November Challenge 2016
Friends Meeting, Gift and Chef
March Challenge 2018 DIV 2
Pishty and Triangles, Chef and Easy Problem, A Big Sale, Mix the Colors, Chef and Glove, Minions and Voting, Minion Chef and Bananas, Embedding a Tree (Challenge)
March Cook-off 2018 Division 1
Chef Restores a Matrix, Chef Restores an Array, Chef Goes to the Cinema
April Challenge 2018 Division 1
Chef and Array (Challenge), Vaibhav and Ministers, Cutting Plants, Highway Crossing, Count Good Prefixes
May Challenge 2018 Division 1
Change the Signs, Dibs on Fibs
December Challenge 2018 Division 1
Max and Electrical Panel, Chef and Interactive XOR
April Challenge 2019 Division 1
Playing with Numbers, Subtree Removal
India