3月3日[Go_deep]Populating Next Right Pointers in Each Node

原题：Populating Next Right Pointers in Each Node

简单的链表二叉树增加Next节点信息，没什么坑。不过还是WA了两次，还是有点菜，继续做，另外leetcode一共150题，考虑两周做完吧，要加速了。

注意：看清楚左右和递归，像标题说的，Go_deep吧。

/**

 * Definition for binary tree with next pointer.

 * struct TreeLinkNode {

 *  int val;

 *  TreeLinkNode *left, *right, *next;

 *  TreeLinkNode(int x) : val(x), left(NULL), right(NULL), next(NULL) {}

 * };

 */

class Solution {

public:

    void connect(TreeLinkNode *root) {

        if (root == NULL) return;

        

        if (root->left != NULL)

        {

            root->left->next = root->right;

            

            TreeLinkNode *go_deep_left = root->left->right;

            TreeLinkNode *go_deep_right = (root->right != NULL)?(root->right->left):NULL;

            

            while (go_deep_left != NULL && go_deep_right != NULL)

            {

                go_deep_left->next = go_deep_right;

                

                go_deep_left = go_deep_left->right;

                go_deep_right = go_deep_right->left;

            }

        }

        

        connect(root->right);

        connect(root->left);

    }

};