LeetCode_Populating Next Right Pointers in Each Node II
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 { public: void connect(TreeLinkNode *root) { // Start typing your C/C++ solution below // DO NOT write int main() function while(root){ TreeLinkNode *head = NULL; TreeLinkNode *pre = NULL; for(;root;root = root->next){ if(!head) head = root->left ? root->left : root->right; if(root->left){ if(pre)pre->next = root->left; pre = root->left; } if(root->right){ if(pre) pre->next = root->right; pre = root->right; } }// end of for root = head; } // end of while } };
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