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【leetcode】Binary Tree Level Order Traversal
每日一练,
Given a binary tree, return the level order traversal of its nodes‘ values. (ie, from left to right, level by level).
For example:
Given binary tree {3,9,20,#,#,15,7}
,
3 / 9 20 / 15 7
return its level order traversal as:
[ [3], [9,20], [15,7] ]
代码如下:
class Solution { public: int level(TreeNode *node) { if (node == NULL) return 0; if (node->left == NULL && node->right == NULL) return 1; return max(level(node->left),level(node->right)) + 1; } void levelPush(TreeNode *node, int height, vector<int> &vec, int cur_height){ if (height == cur_height) vec.push_back(node->val); if (node->left != NULL) levelPush(node->left, height, vec, cur_height + 1); if (node->right != NULL) levelPush(node->right, height, vec, cur_height + 1); } vector<vector<int> > levelOrder(TreeNode *root) { int height = level(root); vector<vector<int> > vvec; for(int i = 1;i <= height;i++) { vector<int> vec; levelPush(root, i, vec, 1); vvec.push_back(vec); } return vvec; } };
【leetcode】Binary Tree Level Order Traversal
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