14.Longest Common Prefix (String)

class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
        int vSize = strs.size();
        string result = "";
        if(vSize == 0) return result;
        else if(vSize == 1) return strs[0];
        
        result = strs[0];
        int i,j;
        for(i = 1; i < vSize; i++){
            for(j = 0; j < result.length() && j < strs[i].length(); j++){
                if(strs[i][j] != result[j]) break;
            }
            result = result.substr(0,j); //截取字符串
        }
        return result;
    }
};