PAT 甲级 1162 Postfix Expression

1162 Postfix Expression (25 分)
Given a syntax tree (binary), you are supposed to output the corresponding postfix expression, with parentheses reflecting the precedences of the operators.

Input Specification: Each input file contains one test case. For each case, the first line gives a positive integer N (≤ 20) which is the total number of nodes in the syntax tree. Then N lines follow, each gives the inf

PAT 甲级 1162 Postfix Expression最先出现在Python成神之路。