摘要:
Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concate 阅读全文
摘要:
D. Soldier and Number Game time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output D. Soldier an 阅读全文