leetcode-14. Longest Common Prefix

14. Longest Common Prefix

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

要求一个字符串数组里面最长公共前缀字符串（数组里面所有字符串）

一开始求成了字符串数组里面最长公共前缀字符串（任意两个字符串）就变成了如下代码

java代码:

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

 符合题意答案:

public class Solution {
    public String longestCommonPrefix(String[] strs) {
        if(strs.length==0)return "";
        int a=-1;
        int m=0;
        while(a<strs[0].length()&&m!=1){
            a++;
        for(int i=0;i<(strs.length-1);i++){
            if(a>=strs[i].length()||a>=strs[i+1].length()||strs[i].charAt(a)!=strs[i+1].charAt(a))
                {
                    m=1;
                    break;
                }
        }
        }
        return strs[0].substring(0,a);
    }
}