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.
Time: O(M * N)
class Solution { public String longestCommonPrefix(String[] strs) { if (strs == null || strs.length == 0) { return ""; } int len = strs[0].length(); for (int i = 0; i < len; i++) { char cur = strs[0].charAt(i); for (int j = 1; j < strs.length; j++) { if (i == strs[j].length() || strs[j].charAt(i) != cur) { return strs[0].substring(0, i); } } } return strs[0]; } }
[LC] 14. Longest Common Prefix
原文：https://www.cnblogs.com/xuanlu/p/11832643.html