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Broken Firewalleasy
Bit ManipulationMathString
Closest Star Systemseasy
MathDivide and ConquerSorting
Galactic Bounty Contracteasy
Hash TableString Parsing
Time To Play Faireasy
StringGraphMatrix
Codey's Tutor Challengemedium
SortingGreedyHeap (Priority Queue)
Rotting Orangesmedium
GraphMatrixBreadth-First SearchQueue
Supply Squadmedium
GraphHeap (Priority Queue)BacktrackingDynamic ProgrammingShortest Path
Cosmic Candy Crushhard
Divide and ConquerDynamic ProgrammingMemoization
Magical Median Challengehard
MathDivide and ConquerSortingBinary Search

Some Questions adapted from Coding Quest