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Longest Common Prefix

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

(每个字符串从0开始的公共部分即最长公共前缀)

C++代码如下:

#include<iostream>#include<string>#include<vector>using namespace std;class Solution {public:    string longestCommonPrefix(vector<string> &strs) {        if(strs.empty())            return "";        string s1=strs[0];        string s2;        size_t len=s1.size();        for(size_t i=1;i<strs.size();i++)        {            s2=strs[i];            if(s2.size()<len)                len=s2.size();            for(size_t j=0;j<len;j++)            {                if(s1[j]!=s2[j])                {                    len=j;                    break;                }            }        }        return s1.substr(0,len);    }};int main(){    vector<string> vec={"aaaaai","aaaaa","aaaa","aaab","aaaagg"};    Solution s;    cout<<s.longestCommonPrefix(vec)<<endl;}

运行结果:

Longest Common Prefix