107. Binary Tree Level Order Traversal II LeetCode
2016-02-11 22:23
501 查看
题意:二叉树的层序遍历。
题解:BFS即可。
题解:BFS即可。
class Solution { public: vector<vector<int>> levelOrderBottom(TreeNode* root) { queue<TreeNode*> q; vector<vector<int>> ans; while(!q.empty()) q.pop(); ans.clear(); if(root == NULL) return ans; q.push(root); while(!q.empty()) { int n = q.size(); vector<int> v; for(int i = 0; i < n; i++) { TreeNode* now = q.front(); v.push_back(now->val); q.pop(); if(now->left != NULL) q.push(now->left); if(now->right != NULL) q.push(now->right); } ans.push_back(v); } vector<vector<int>> anss; int n = ans.size(); for(int i = n - 1; i >= 0; i--) { anss.push_back(ans[i]); } return anss; } };
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