摘要：
The problem Find three non negative integers $x$, $y$ and $z$ that meet the following conditions: \begin{cases} wx + dy = p, \\\\ x + y + z = n. \end{ 阅读全文
摘要：
Problem Statement Let us define the oddness of a permutation \(p = \\{p_1, p_2, \dots, p_n\\}\) of \(\\{1, 2, \dots, n\\}\) as \(\sum_{i=1}^{n} | i - 阅读全文