Leetcode 117:populating Next Right pointers in each Node II

Source: Internet
Author: User

Follow up to Problem "populating Next right pointersin each Node".

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


    • Constant extra space.

For example,
Given The following binary tree,

         1       /        2    3     /\        4   5    7

After calling your function, the tree is should look like:

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

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Binary tree for hierarchical traversal//judging the bottom-level condition: If the currently accessed layer has a child node in either node, the current layer is not the lowest level. Class solution{public:treelinknode* Nextleft;bool hastotheend;void Connect (treelinknode *root) {if (!root)  return ; hastotheend = False;int level = 1;while (!hastotheend) {hastotheend= true;nextleft= NULL; Visitlevel (root, level); ++level;}} void Visitlevel (treelinknode* node, int level) {if (level = = 1) {if (nextleft! = NULL) {nextleft->next = node;} Nextleft = Node;if (node->left! = NULL | | Node->right! = NULL) {hastotheend= false;}} if (node->left)  visitlevel (Node->left, LEVEL-1), if (node->right)  visitlevel (Node->right, Level -1);};

Leetcode 117:populating Next Right pointers in each Node II

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