Write a function to find the longest common prefix string amongst an array of strings.
要减少比较次数。在实现过程中我的想法是,2个2个比较,那么只要遍历一次数组就好。而且,在比较过程中,以较短的那个长度作为最大比较距离,较长的后半部分是不可能存在公共前缀的。
public class Solution {
public String longestCommonPrefix(String[] strs) {
if(strs.length == 0)return "";
String prefix = strs[0];
for(int i = 1;i<strs.length;i++)
{
int len = strs[i].length()>prefix.length()?prefix.length():strs[i].length();
prefix = prefix.substring(0,len);
if(prefix.length() == 0)
return "";
for(int j = 0;j<len;j++)
{
if(prefix.charAt(j)!=strs[i].charAt(j))
{
prefix = prefix.substring(0, j);
break;
}
}
}
return prefix;
}
}
LeetCode Longest Common Prefix,布布扣,bubuko.com
LeetCode Longest Common Prefix
原文地址:http://www.cnblogs.com/jessiading/p/3745869.html