假设一个算数表达式中可包含三种括号：圆括号，方括号和花括号且这三种括号可以按任意次序嵌套使用。试利用栈的运算，编写判别表达式中所含括号是否正确配对出现的算法-Suppose an arithmetic expression can contain three brackets: parentheses, brackets and braces and three brackets can be nested in any order. The trial use of the computing stack, the preparation of the algorithm is correct pairing of the discriminant expression contained in parentheses appear