Search in Rotated Sorted Array 在有一个转折的有序数组中查找某元素,二分法
题目:Supposeanarraysortedinascendingorderisrotatedatsomepivotunknowntoyoubeforehand.(i.e.,[0,1,2,4,5,6,7]mightbecome[4,5,6,7,0,1,2]).Youaregivenatargetvaluetosearch.Iffoundinthearrayreturnitsindex,other