rename refactoring - MutableSet.add -> addIfAbsent
use MutableSet.add instead of addIfAbsent as possible. it's more meaningful.
rename refactoring: RootedTree.create -> .wrap
rename refactoring: SingleSourceShortestPath -> SingleSourceShortestPathAlgorithm
simple rename refactoring
rename refactoring - RangeMinimumQueryResult -> RangeMinimumQuerySession
rename LowestCommonAncestorPreprecessed -> LowestCommonAncestorQuerySessionm, LowestCommonAncestor -> LowestCommonAncestorAlgorithm
rename FloydWarshall -> FloydWarshallAlgorithm