叶子落满了秋

摘要： 一、题目 Given an integer $n$, Chiaki would like to find three positive integers $x$, $y$ and $z$ such that: $n=x+y+z$, $x\mid n$, $y \mid n$, $z \mid n$ 阅读全文

摘要： 一、题面 You want to form a target string of lowercase letters. At the beginning, your sequence is target.length '?' marks. You also have a stamp of lower 阅读全文