(1) for i 1 to n-1 2) for j=i+1 to n 3】 iE(A[i打>A[j1) (4) exchange A[i]and A[il How many times is the comparison Ali]Alj]made in Line 3? critical operation Principle 1.1 (Sum Principle) The size of a union of a family of mutually disjoint finite sets is the sum of the sizes of the sets. Us. IS:l.critical operation