1. Consider the following mystery function on a binary tree (not necessarily a BST). public int mysteryHelper(TreeNode cur){ if(cur==null) return 0; else{ int r=mysteryHelper(cur. getLeft()) + mysteryHelper(cur. getRight()); if(((cur. getLeft()!=null && ((Integer) cur. getLeft().getValue())pareTo(cur. getValue())>0)|| (cur. getRight()!=null && ((Integer) cur. getRight().getValue())pareTo(cur. getValue())<0)){ r++; } return r; } } public int mystery(){ return mysteryHelper(root); }

Eye injuries usually occur as a result of all of the following things, except: a) proper machine operation b) battery explosion c) falling or flying debris d) electric welding arc

Consider the following statements: struct nametype{string first; string last; }; struct coursetype{string name; int callnum; int credits; char grade; }; struct studenttype{nametype name; double gpa; coursetype course; }; studenttype student; studenttype classlist[100]; coursetype course; nametype name; mark the following statements as valid or invalid. if a statement is invalid, explain why.a.) student.course.callnum = "csc230"; b.) cin > > student.name; c.) classlist[0] = name; d.) classlist[1].gpa = 3.45; e.) name = classlist[15].name; f.) student.name = name; g.) cout < < classlist[10] < < endl; h.) for (int j = 0; j < 100; j++)classlist[j].name = name; i.) classlist.course.credits = 3; j.) course = studenttype.course;

You draw two cards from a standard deck of 52 cards, but before you draw the second card, you put the first one back and reshuffle the deck. (a) are the outcomes on the two cards independent? why?