SOLVE THE QUESTION IN CPP, USING NAMESPACE STD, IN A SIMPLE BUT HIGHLY EFFICIENT WAY, AND PROVIDE IT WITH THIS RESTYLING: no comments, no space between operator and operand but proper margin and indentation, brackets open on the next line always and do not forget to rename variables as short as possible, possibly alphabets
使用CPP解决问题，使用NAMESPACE STD，以简单但高效的方式，并提供以下重构： 无注释，运算符和操作数之间无空格，但有适当的边距和缩进，括号始终在新行打开，并且不要忘记将变量重命名为尽可能短，最好是字母
