NSMutableData *data = [NSMutableData dataWithLength:arr.size];
Овечкин продлил безголевую серию в составе Вашингтона09:40
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Eve Myles inspired by detective who solved 30-year cold case in new role
描述：找出一个连续子数组，若对该子数组升序排序，则整个数组变为升序。返回符合题意的最短子数组长度。