The binary search for "version C" is extracted as follows:二分查找“版本C”摘录如下：
When there are multiple elements to be searched in the array A, the return value of the function:当数组A中有多个待查找元素e时，函数的返回值为：
AReturn the element whose rank is smallest 返回秩最小者
BReturn the element whose rank is biggest返回秩最大者
CReturn the element whose rank is in the middle返回秩位于正中间者
DRandomly return one of them随机返回其中一个