解题思路：二分法

class Solution {public int stockManagement(int[] stock) {int i = 0,j = stock.length-1;while(i < j){int m = (i + j)/ 2;if (stock[j] > stock[m]) j = m;else if (stock[j] < stock[m]) i= m+1;else j--;}return stock[i];}
}