LeetCode | Palindrome Partitioning

题目:

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:

利用动态规划DP的思路做,过程类似于
http://blog.csdn.net/lanxu_yy/article/details/17310247。惟一的区别是在word break中检查word是否符合要求与检查palindrome不同。

代码:

class Solution {
public:
    vector<bool>* dp; 
    vector<vector<string>> result;
    vector<string> str;
    vector<vector<string>> partition(string s) {
        if(s.size()>0)
        {
            dp = new vector<bool>[s.size()];
            for(int i=0;i<s.size();i++)
            {
                for(int j=i;j<s.size();j++)
                {
                    dp[i].push_back(isPalindrome(s,i,j));
                }
            }
            
            output(s, s.size()-1);
        }
        return result;
    }
    
    void output(string s, int k)
    {
        if(k<0)
        {
            vector<string> tmp;
            for(int i=str.size()-1;i>=0;i--)
            {
                tmp.push_back(str[i]);
            }
            result.push_back(tmp);
        }
        else
        {
            for(int i=0;i<=k;i++)
            {
                if(dp[i][k-i])
                {
                    str.push_back(s.substr(i,k-i+1));
                    output(s, i-1);
                    str.pop_back();
                }
            }
        }
    }
    
    bool isPalindrome(string s, int i, int j)
    {
        for(;i<j;i++,j--)
        {
            if(s[i]!=s[j])
            {
                return false;
            }
        }
        return true;
    }
};
    原文作者:Allanxl
    原文地址: https://blog.csdn.net/lanxu_yy/article/details/17320899
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