/remove one character in specified positioncomputing representative /words with same representatives are adjacentso populate map mapreptowordforauto str groupswords string rep strrep erasei )reptowordrep push_backstr )/and then look for map values with more than one string forauto entry reptoword const vector clique entry secondifclique size> forint clique size)++ forint clique size)++ adjwordscliquep push_backcliqueq )adjwordscliqueq push_backcliquep )return adjwordsfigure (continuedas suchit is possible that data structure that supports the map operations but does not guarantee sorted order can perform bettersince it is being asked to do less explores this possibility and discusses the ideas behind the alternative map implementation that ++ adds to the standard libraryknown as an unordered_map an unordered map reduces the running time of the implementation from sec to sec summary we have seen uses of trees in operating systemscompiler designand searching expression trees are small example of more general structure known as parse treewhich is central data structure in compiler design parse trees are not binarybut are relatively simple extensions of expression trees (although the algorithms to build them are not quite so simple