Write a function to find the longest common prefix string amongst an array of strings.
class Solution {
public:
string longestCommonPrefix(vector<string>& strs) {
string res;
int nums = strs.size();
if (nums == 0) {
return res;
}
int len = (strs[0]).size();
for (const string& str : strs) {
if (str.size() < len) {
len = str.size();
}
}
for (int i = 0; i < len ; ++i) {
char c = (strs[0])[i];
bool same = true;
for (const string& str : strs ) {
if (str[i] != c) {
same = false;
break;
}
}
if (!same) {
break;
}
res.push_back(c);
}
return res;
}
};