说明：  多家大公司笔试题目程序解答： 1.1-20的两个数把和告诉A,积告诉B，A说不知道是多少，B也说不知道， 这时A说我知道了，B接着说我也知道了，问这两个数是多少？ 设这两个数是x和y。且x+y=A, xy=B 计算结果：1~20： 结果为2，2 2~20： 结果为4，3 2. 2~100中两个数，把和告诉A，乘积告诉B，A说：我不知道，你也不知道； 这时B说我知道了，A说我也知道了。 设这两个数是x和y，且x+y=A, xy=B
(Many large companies program written questions: The two Numbers 1.1-20 and tell A, B, tell how much is A says don t know, B also said don t know, Then said I know A, B then said I also know, ask the two Numbers? Set the two Numbers is x and y. And x, y+ xy = B Results: 1 ~ 20: the results for the viewpoint 2 ~ 20:4,3 results )