LongestCommonPrefix.java

/*
 Author:     King, wangjingui@outlook.com
 Date:       Dec 20, 2014
 Problem:    Longest Common Prefix
 Difficulty: Easy
 Source:     https://oj.leetcode.com/problems/longest-common-prefix/
 Notes:
 Write a function to find the longest common prefix string amongst an array of strings.

 Solution: ...
 */
public class Solution {
    public String longestCommonPrefix(String[] strs) {
        if (strs.length == 0) return new String("");
        for(int i = 0;i < strs[0].length(); ++i){
            for(int j = 1;j < strs.length; ++j){
                if(i >= strs[j].length() || strs[j].charAt(i) != strs[0].charAt(i)) 
                    return strs[0].substring(0,i);
            }
        }
        return strs[0];
    }
}