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Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock),

leetcode 14：          Longest Common Prefix Write a function to find the longest common prefix string amongst an array of strings. 解答： 给定一组字符串，找出他们的最长公共子序列。 public class Solution { public Strin