牛客网-《剑指offer》-旋转数组的最小数

题目：http://www.nowcoder.com/practice/9f3231a991af4f55b95579b44b7a01ba

C++

 class Solution {
 public:
     int minNumberInRotateArray(vector<int> arr) {
         int len = arr.size();
         if (len == ) return ;
         int ret = arr[];
         for (int i = ; i < len; i++) {
             if (arr[i] < ret) return arr[i];
         }
         return ret;
     }
 };