14. Longest Common Prefix

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

一刷

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