UVA - 11995 - I Can Guess the Data Structure! STL 模拟
Thereisabag-likedatastructure,supportingtwooperations:1xThrowanelementxintothebag.2Takeoutanelementfromthebag.Givenasequenceofoperationswithreturnvalues,you’regoingtoguessthedatastructure.Itisastack(L