1Add Edges to Make Degrees of All Nodes EvenHardSolve → 2Longest Path With Different Adjacent CharactersHardSolve → 3Maximum Total Importance of RoadsMediumSolve → 4Detect Pattern of Length M Repeated K or More TimesEasySolve → 5Convert Integer to the Sum of Two No-Zero IntegersEasySolve → 6Number of Steps to Reduce a Number to ZeroEasySolve → 8Maximum Score From Grid OperationsHardSolve →