* @param {string} num 非负整数的字符串形式（可能含前导零）
During his time at Uber, Michael became a member of Pentagon’s Defense Business Board, an advisory group that shares best practices from the private sector with government agencies. At the time of his appointment, he was the only board member with tech startup experience.，这一点在爱思助手下载最新版本中也有详细论述
（一）是本案当事人或者当事人的近亲属的；。业内人士推荐WPS官方版本下载作为进阶阅读
* @return {number} - 最短无序连续子数组的长度，排序该子数组后整个数组升序