[LeetCode] Longest Common Prefix

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

class Solution {
public:
    string longestCommonPrefix(vector<string>& strs) {
        if (strs.empty()) return "";
        
        for (int i = 0; i < strs[0].size(); ++i)
            for (int j = 1; j < strs.size(); ++j) {
                if (strs[j][i] != strs[0][i]) return strs[0].substr(0,i); 
            }
        
        return strs[0];
    }
};