LeetCode OJ - 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"]
  ]

解题思路：

　　因为要返回所有的回文分割，深搜是一种很自然的想法。

代码：

class Solution {
public:
    bool isPalindrome(string str) {
        for (int i = 0, j = str.length() - 1; i <= j; i++, j--) {
            if (str[i] != str[j]) {
                return false;
            }
        }
        return true;
    }
    void search(string s, vector<string> cur_ans, vector<vector<string>> &ans) {
        if (s.empty()) {
            ans.push_back(cur_ans);
        }
        else {
            for (int len = 1; len <= s.length(); len++) {
                string str = s.substr(0, len);
                if (isPalindrome(str)) {
                    cur_ans.push_back(str);
                    search(s.substr(len), cur_ans, ans);
                    cur_ans.pop_back();
                }
            }
            
        }
    }
    vector<vector<string>> partition(string s) {
        vector<string> cur_ans;
        vector<vector<string>> ans;
        search(s, cur_ans, ans);
        return ans;
    }
};