A. Maximize?
Problem Statement
You are given an integer x x x. Your task is to find any integer y y y ( 1 ≤ y < x ) (1\le y<x) (1≤y<x) such that gcd ( x , y ) y \gcd(x,y)y gcd(x,y)y is maximum possible.
Note that if there is more tha…
低功耗编程
一、修改主频
STM32F4xx系列主频为168MHz,当板载8MHz晶振时,系统时钟HCLK满足公式 H C L K H S E P L L N P L L M P L L P HCLK \frac{HSE \times PLLN}{PLLM \times PLLP} HCLKPLLMPLLPHSEPLLN,在文件stm32f4xx.h中可修…