Не все тут смехуечки да пиздохаханьки, вот шпаргалки по C++, например https://www.walletfox.com/course/cheatsheets_cpp.php
Рубрика "как работают сраные компьютеры" https://stackoverflow.com/questions/53452713/why-is-2-i-i-faster-than-2-i-i-in-java/53453588#53453588
Stack Overflow
Why is 2 * (i * i) faster than 2 * i * i in Java?
The following Java program takes on average between 0.50 secs and 0.55 secs to run:
public static void main(String[] args) {
long startTime = System.nanoTime();
int n = 0;
for (int i = ...
public static void main(String[] args) {
long startTime = System.nanoTime();
int n = 0;
for (int i = ...