1Minimum Operations to Reduce an Integer to 0MediumSolve → 2Filling Bookcase ShelvesMediumSolve → 3Find the Student that Will Replace the ChalkMediumSolve → 4Check If Array Pairs Are Divisible by kMediumSolve → 5Count Univalue SubtreesMediumSolve → 7Random Pick with WeightMediumSolve →