摘要:
You are given a list of train stations, say from the station 1 to the station 100. The passengers can order several tickets from one station to anothe 阅读全文
摘要:
题目来源:Sum 限制:1000ms 32768K Define the function S(x) for xx is a positive integer. S(x) equals to the sum of all digit of the decimal expression of x. P 阅读全文