leetcode: Populating Next Right Pointers in Each Node II
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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) { if( root == NULL) return; if( root->left && root->right){ root->left->next = root->right; root->right->next = nextNode( root->next); connect( root->right);//这里的顺序很关键,要先递归右子树再递归左子树,不然当左子树构建时右子树还没中next指针还没构建 connect( root->left); } else if( root->left){ root->left->next = nextNode( root->next); connect( root->left); } else if( root->right){ root->right->next = nextNode( root->next); connect( root->right); } else return; } TreeLinkNode *nextNode( TreeLinkNode * root){ if( root == NULL) return NULL; if( root->left) return root->left; else if( root->right) return root->right; else return nextNode( root->next); }};
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