[LeetCode] Longest Common Prefix

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

Solution:

class Solution {
public:
    string longestCommonPrefix(vector<string> &strs) {
        int len = 0, n = strs.size(), MaxL = 0;
        if(n == 0) return "";
        else if(n == 1) return strs[0];
        
        for(int i = 0;i < n;i++)
            if(strs[i].length() > MaxL)
                MaxL = strs[i].length();
        
        bool flag = true;
        while(flag)
        {
            if(len >= MaxL) 
                break;
            
            for(int i = 0;i < n;i++)
            {
                if(strs[i][len] == strs[0][len])
                    continue;
                else
                {
                    flag = false;
                    break;
                }
            }
            
            if(flag == true)
                len++;
        }
        
        return strs[0].substr(0, len);
    }
};