【leetcode刷题笔记】Longest Common Prefix

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

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题解：以strs[0]为模板，每次挨个查看是否所有的串里面是否第i位上都和strs[0]一样，如果都一样，把i位置上的字符放到answer里面，i++，继续循环，否则返回当前的answer。

代码如下：

public class Solution {
    public String longestCommonPrefix(String[] strs) {
        if(strs == null || strs.length == 0)
            return "";
        
        StringBuffer answer = new StringBuffer();
        for(int i = 0;i < strs[0].length();i++){
            char now = strs[0].charAt(i);
            for(int j = 1;j < strs.length;j++){
                if(i>strs[j].length()-1 || strs[j].charAt(i) != now)
                    return answer.toString();
            }
            answer.append(now);
        }
        return answer.toString();
    }
}