leetCode 14. Longest Common Prefix 字符串

14. Longest Common Prefix

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

题目大意：求一组字符串的最长前缀。

代码如下：

class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
        if(strs.size() == 0)
            return "";
        int minStrLen = strs[0].size();
        string result;
        for(int i = 0 ;i < strs.size();i++)
        {
            if(strs[i].size() < minStrLen)
            {
                minStrLen = strs[i].size();
            }
        }
        int i = 0;
        for( ; i < minStrLen;i++)
        {
            char a = strs[0][i];
            int j = 0;
            for( ;j < strs.size();j++)
            {
                if(strs[j][i] != a)
                    break;
            }
            if(j < strs.size())
                break;
        }
        
        result = strs[0].substr(0,i);
        return result;
    }
};

2016-08-10 17:44:00