Populating Next Right Pointers in Each Node II

Populating Next Right Pointers in Each Node IIOct 28 '123191 / 7859

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
/**
 * 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 {
    void broadSearch(TreeLinkNode* queueS)
    {
        if(queueS == NULL)
            return;
        TreeLinkNode* newQueueH = NULL;
        TreeLinkNode* newQueueT = NULL;
        while(queueS)
        {
            if(queueS->left)
            {
                if(newQueueH == NULL)
                    newQueueH = queueS->left;
                if(newQueueT == NULL)
                    newQueueT = queueS->left;
                else{
                    newQueueT->next = queueS->left;
                    newQueueT = queueS->left;
                }
            }
            if(queueS->right)
            {
                if(newQueueH == NULL)
                    newQueueH = queueS->right;
                if(newQueueT == NULL)
                    newQueueT = queueS->right;
                else{
                    newQueueT->next = queueS->right;
                    newQueueT = queueS->right;
                }

            }
            queueS = queueS->next;
        }
        broadSearch(newQueueH );
    }
public:
    void connect(TreeLinkNode *root) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        TreeLinkNode* queueS = root;
        broadSearch(queueS);
        
    }
};


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