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[LeetCode] Longest Common Prefix

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

 

思路:每个字符串都与第0个字符串比较,设置一个变量,记录每个字符串与第0个字符串不匹配位置的最小值

   时间复杂度O(n1+n2+...),空间复杂度O(0)

 1 class Solution { 2 public: 3     string longestCommonPrefix(vector<string> &strs) { 4         if (strs.empty()) return ""; 5          6         int length = strs[0].size() - 1; 7         for (int i = 1; i < strs.size(); ++i) { 8             for (int j = 0; j <= length; ++j) { 9                 if (strs[0][j] != strs[i][j])10                     length = j - 1;11             }12         }13         14         return strs[0].substr(0,length + 1);15         16     }17 };

 

[LeetCode] Longest Common Prefix