You are given an integer num. You can swap two digits at most once to get the maximum valued number.
Return the maximum valued number you can get.
\n\n\n
Example 1:
\n\n\nInput: num = 2736\nOutput: 7236\nExplanation: Swap the number 2 and the number 7.\n\n\n
Example 2:
\n\n\nInput: num = 9973\nOutput: 9973\nExplanation: No swap.\n\n\n
\n
Constraints:
\n\n0 <= num <= 108给定一个非负整数，你至多可以交换一次数字中的任意两位。返回你能得到的最大值。
\n\n示例 1 :
\n\n\n输入: 2736\n输出: 7236\n解释: 交换数字2和数字7。\n\n\n
示例 2 :
\n\n\n输入: 9973\n输出: 9973\n解释: 不需要交换。\n\n\n
注意:
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