天下事有难易乎？

Sign In and Sign Out (25)At the beginning of every day, the first person who signs in the computer room will unlock the door, and the last one who signs out will lock the door. Given the records of si

Spell It Right (20)Given a non-negative integer N, your task is to compute the sum of all the digits of N, and output every digit of the sum in English.Input Specification:Each input file contains one

1003. Emergency (25)As an emergency rescue team leader of a city, you are given a special map of your country. The map shows several scattered cities connected by some roads. Amount of rescue teams in

PAT 甲级

PAT 甲级 1001

1004. Counting Leaves (30)时间限制400 ms内存限制65536 kB代码长度限制16000 B判题程序Standard作者CHEN, YueA family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no ch...

Counting Leaves (30)A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. InputEach input file contains one test case. Each case sta