[leetcode]14.Longest Common Prefix

最新推荐文章于 2024-01-22 08:26:35 发布

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本文介绍了一种在字符串数组中查找最长公共前缀的方法。通过一个逐字符比较的算法，该方法能有效处理如['flower','flow','flight']等输入，返回'fl'作为最长公共前缀。

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

If there is no common prefix, return an empty string "".

Example 1:

Input: ["flower","flow","flight"]
Output: "fl"
Example 2:

Input: ["dog","racecar","car"]
Output: ""
Explanation: There is no common prefix among the input strings.

Note:

All given inputs are in lowercase letters a-z.

Solution：

class Solution {
    public String longestCommonPrefix(String[] strs) {
        if (strs.length == 0) {
            return "";
        }
        String prefix = strs[0];
        for (int i = 1 ; i < strs.length ; i++) {
            while(strs[i].indexOf(prefix) != 0) {
                prefix = prefix.substring(0, prefix.length() - 1);
                if (prefix.isEmpty()) {
                    return "";
                }
            }
        }
        return prefix;
    }
}