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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"]  ]

与Restore IP Addresses类似。。都使用回溯法。。。

 

C++实现代码:

#include<iostream>#include<vector>#include<string>using namespace std;class Solution{public:    vector<vector<string>> partition(string s)    {        if(s.empty())            return vector<vector<string> >();        vector<vector<string> > ret;        vector<string> path;        helper(s,0,ret,path);        return ret;    }    void helper(string s,int start,vector<vector<string> > &ret,vector<string> &path)    {        int n=path.size();        int i;        int sum=0;        for(int j=0; j<n; j++)        {            sum+=path[j].size();        }        if(sum==(int)s.size())        {            ret.push_back(path);            return;        }
     //start+i<=(int)s.size()是为了分割的最后一个字符串不重复。
for(i=1; i<=(int)s.size()&&start+i<=(int)s.size(); i++) { string tmp=s.substr(start,i); if(!isPalindrome(tmp)) continue; path.push_back(tmp); helper(s,start+i,ret,path); path.pop_back(); } } bool isPalindrome(string s) { if(s.empty()) return true; int i=0; int j=s.length()-1; while(i<=j) { if(s[i]!=s[j]) return false; i++; j--; } if(i>j) return true; return false; }};int main(){ Solution s; vector<vector<string> > result=s.partition(string("aab")); for(auto a:result) { for(auto v:a) cout<<v<<" "; cout<<endl; }}

运行结果:

 

Palindrome Partitioning