后缀式转中缀式



将由数字和四则运算符组成的后缀表达式变换为中缀表达式。

输入的后缀表达式包含的运算符不超过15个。

要求转换后的中缀表达式中不应出现不必要的括号。例如，

整个表达式两端的括号要省略，不影响原计算顺序的括号要省

略。-Suffix-type switch-type will be made up of four numbers and the composition operator for suffix expressions transform infix expressions. Enter the suffix operator expression contains not more than 15. Requirements of the post-conversion infix expression in brackets should not be unnecessary. For example, the whole expression at both ends of the brackets should be omitted, the order does not affect the original calculation of the brackets should be omitted.