[Leetcode] palindrome partitioning

Given a stringS, PartitionSSuch that every substring of the partition is a palindrome.

Return all possible palindrome partitioningS.

For example, givenS="aab",
Return

  [    ["aa","b"],    ["a","a","b"]  ]

 

Solution:

DFS

 1 class Solution { 2     private: 3             vector<vector<string> >   m_res; 4     public: 5         vector<vector<string> > partition(string s) 6         { 7             size_t size = s.size(); 8             if(size == 0) 9                 return m_res;10 11             vector<string> str;12             dfs(s, 0, size - 1, str);13             return m_res;14         }15 16         void dfs(string s, size_t begin, size_t end, vector<string>& str)17         {18             if(begin > end)19             {20                 m_res.push_back(str);21                 return;22             }23 24             for(size_t i = begin; i<=  end; i++)25             {26                 if(isPalindrome(s, begin, i))27                 {28                     str.push_back(s.substr(begin, i-begin + 1));29                     dfs(s, i+1, end, str);30                     str.pop_back();31                 }32             }33         }34 35         bool isPalindrome(string s, size_t begin, size_t end)36         {37             if(begin == end)38                 return true;39             while(begin <= end)40             {41                 if(s[begin] == s[end])42                 {43                     begin++;44                     end --;45                 }46                 else47                     return false;48             }49             return true;50         }51 };