LeetCode报错：Line 923: Char 9: runtime error: reference binding to null pointer of type ‘std::_

LeetCode报错

报错原因：
Line 923: Char 9: runtime error: reference binding to null pointer of type ‘std::__cxx11::basic_string<char, std::char_traits, std::allocator >’ (stl_vector.h)

程序中具体原因：
vector数组为空的时候，会出现这个错误。在程序中就是for语句出错，因为当数组为空时，len=0，len-1=-1，所以在for循环中会出错

出错具体代码

class Solution {public:string longestCommonPrefix(vector<string>& strs) {int len=strs.size();string result="";int i=0;while(strs[0][i]!='\0'){for(int j=0;j<len-1;++j){if(strs[j][i]!=strs[j+1][i])return result;}result+=strs[0][i];++i;}return result;}
};

改正后代码（判断数组为空，提前return）

class Solution {public:string longestCommonPrefix(vector<string>& strs) {int len=strs.size();string result="";if(len==0) return result;// 判断是否为空int i=0;while(strs[0][i]!='\0'){for(int j=0;j<len-1;++j){if(strs[j][i]!=strs[j+1][i])return result;}result+=strs[0][i];++i;}return result;}
};

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LeetCode报错：Line 923: Char 9: runtime error: reference binding to null pointer of type ‘std::__cxx11:

LeetCode报错

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