摘要：
The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians 阅读全文
摘要：
Ms. Iyo Kiffa-Australis has a balance and only two kinds of weights to measure a dose of medicine. For example, to measure 200mg of aspirin using 300m 阅读全文
摘要：
引例： Matrix Power Series： 题目大意，给定矩阵A，求A^1+A^2+A^3+...A^N。 题解：已知X=a，可以通过以下矩阵求出ans=a^1+a^2+...a^N ans=矩阵^n后第一行之和-1=矩阵^(n+1)后右上格的和-1。 同理：矩阵也可以，只需要把1改为单位矩阵 阅读全文