Palindrome Partitioning

Given a string s, partition s such that every substring of the partition is a palindrome.

Return all possible palindrome partitioning of s.

For example, given s = "aab",
Return

  [

    ["aa","b"],

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

  ]

思路:这道题是说对一个字符串做处理,找出这个字符串包含的所有回文序列。典型的递归回溯方法。首先定义一个判断字符串是否回文字符串,然后用深度搜索遍历方法,查找目标字符串序列。满足条件则先push到path中,不符合则pop。等index==s.size()是将path push到result。在进行深度搜索。
class Solution {

public:

    bool IsPalindrome(string s,int start,int end)

    {

        while(start<end)

        {

            if(s[start]!=s[end])

                return false;

            start++;

            end--;

        }

        return true;

    }

    void DFS(vector<vector<string> > &result,vector<string> &path,string &s,int index)

    {

        if(index==s.size())

        {

            result.push_back(path);

            return;

        }

        for(int i=index;i<s.size();i++)

        {

            if(IsPalindrome(s,index,i))

            {

                path.push_back(s.substr(index,i-index+1));

                DFS(result,path,s,i+1);

                path.pop_back();

            }

        }

    }

    vector<vector<string>> partition(string s) {

        vector<vector<string> > result;

        vector<string> path;

        result.clear();

        path.clear();

        if(s=="")

            return result;

        DFS(result,path,s,0);

        return result;

    }

};

 

 

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