August Long Challenge 2017
Chef And Fibonacci Array, Chef and Rainbow Array, Flower Pots, Strings and Graphs, Greedy Candidates, Mathison and the Data Warehouse (Challenge), Palindromic Game, Walks on the binary tree, Hill Jumping, Chef and Mover
September Challenge 2017
Sereja and Commands, 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
June Challenge 2018 Division 1
Binary Board, Archi and Tree, Expected Buildings, Vision, Two Flowers, Ways to Work
September Challenge 2018 Division 1
AND Square Subsegments, Selinas the Chefs Falling on the Tree, Sasha and Photos, Chef and Lost Story, Factorize, Table Game, Bad Shuffle
October Challenge 2018 Division 1
Appy and Balloons , Distinct Rows in Submatrices, Coprime Components, Chef and Surprise Chessboard, Minimize Digitsum, Beautiful Bricks, Walk on Tree
Replay of Indian IOI Training Camp (IOITC) #1 (Rated)
CyclesAndColorings, K Perfect Matchings, Circular Intervals
Replay of Indian IOITC 2018 #2 (Rated)
Exact Walks, Coin Denominations, Changing Numbers
China