摘要：
题目来自《算法》第四版习题1.3.9，原题如下：Write a program that takes from standard input an expression without left parentheses and prints the equivalent infix expression with the parentheses inserted. For example, given the input:1 + 2 ) * 3 - 4 ) * 5 - 6 ) ) )your program should print( ( 1 + 2 ) * ( ( 3 - 4 ) * ( 5 阅读全文