October Challenge 2019 Division 2
Chef and Maximum Star Value, Array Modification, Operations on a Matrix, Phone Prices, Even Edges
October Lunchtime 2019 Division 2
Counting Inversions Revisited, Box Game, Khaled in HIT
November Challenge 2019 Division 1
Physical Exercise, Smallest Beautiful Number, From Zero to Infinity, A Simple Game, Single Point of Failure, (Challenge) Coloring Triangulations
January Challenge 2020 Division 1
Doraemon, (Challenge) Building Anthills, Chefland Army, Chefina and Prefix Suffix Sums, Chef and Dynamo
July Challenge 2020 Division 1
Chefina and Swaps, Chef and Dragon Dens, Missing a Point, Doctor Chef
August Challenge 2020 Division 1
Insanely Hard School Exams, Subsequence Frequency Counting, Smallest KMP, Chef and Wedding Arrangements
September Challenge 2020 Division 1
Chefina and Swap, Chef and Trump Cards, Find XOR, Rotate the Polyline, Divide Candies, Ada Matrix
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