populating-next-right-pointers-in-each-node-ii leetcode C++

Follow up for problem "Populating Next Right Pointers in Each Node".

What if the given tree could be any binary tree? Would your previous solution still work?

Note:

You may only use constant extra space.

For example, Given the following binary tree,

1 / \ 2 3 / \ \ 4 5 7

After calling your function, the tree should look like:

1 -> NULL / \ 2 -> 3 -> NULL / \ \ 4-> 5 -> 7 -> NULL

C++

/** * 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){ while(root){ TreeLinkNode L(-1); TreeLinkNode *f; TreeLinkNode *p; f = &L; p = root; while(p){ if(p->left != NULL){ f->next = p->left; f = f->next; } if(p->right != NULL){ f->next = p->right; f = f->next; } p = p->next; } root = L.next; } } };

 

转载于:https://www.cnblogs.com/vercont/p/10210259.html