"People who analyze algorithms have double happiness..." Donald E.Knuth (1938~) 4口·￥①，4三，t更，里)Q0 Jun Ma (majunainju.edu.cn) 2-3 Counting March 9.2022 3/35“People who analyze algorithms have double happiness . . .” Donald E. Knuth (1938 ∼) Jun Ma (majun@nju.edu.cn) 2-3 Counting March 9, 2022 3 / 35