LeetCode OJ 14Longest Common Prefix

Posted 2020-06-16 xujian_2014

题目链接：https://leetcode.com/problems/longest-common-prefix/

题目：Write a function to find the longest common prefix string amongst an array of strings.

解题思路：寻找字符串数组的最长公共前缀，将数组的第一个元素作为默认公共前缀，依次与后面的元素进行比较，取其公共部分，比较结束后，剩下的就是该字符串数组的最长公共前缀，示例代码如下：

public class Solution 
{
	public String longestCommonPrefix(String[] strs)
	{
		if (strs == null || strs.length == 0)
		{
			return "";
		}
		String prefix = strs[0];
		for (int i = 1; i < strs.length; i++)
		{
			int j = 0;
			while (j < strs[i].length() && j < prefix.length() && strs[i].charAt(j) == prefix.charAt(j))
			{
				j++;
			}
			if (j == 0)
			{
				return "";
			}
			prefix = prefix.substring(0, j);
		}
		return prefix;
	}
}