输入任意四个整数(0到10)，运算符只有加减乘除，还有括号.每个数只能且必须用一次。要求判断这些表达的结果中是否有24。如果有，输出计算表达式：如输入4，6，1，1，输出 4*6*1*1 =24-Enter any four integer (0-10), the operator only addition, subtraction, there are brackets for each number can only be and must be used once. Required to determine the expression of results 24. If so, output　uating the expression: If the input 4,6,1,1, output 4* 6* 1* 1 = 24