14. 最长公共前缀

 

难度简单

编写一个函数来查找字符串数组中的最长公共前缀。

如果不存在公共前缀,返回空字符串 ""

 

示例 1:

输入:strs = ["flower","flow","flight"]
输出:"fl"

示例 2:

输入:strs = ["dog","racecar","car"]
输出:""
解释:输入不存在公共前缀。



class Solution:
    def longestCommonPrefix(self, strs: List[str]) -> str:
        final_res = ''
        min_len = min([ len(ss) for ss in strs])
        for i in range(min_len):
            cur = strs[0][i]
            for ss in strs[1:]:
                if ss[i] != cur:
                    res = ''
                    return final_res
            final_res+=cur
        return final_res
                    

 



class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
        sort(strs.begin(),strs.end());
        string a = strs.back();
        string b = strs[0];
        int num = min(a.size(),b.size());
        int len = 0;
        int i = 0;
        while(i < num) {
            if (a[i]==b[i]) {
                len++;
            } else {
                break;
            }
            i++;
        }
        return a.substr(0,len);
    }
};

 

posted @ 2022-09-05 23:39  乐乐章  阅读(21)  评论(0编辑  收藏  举报