] 观察发现对于每个node如果它在vertical level k上那它的左子树在level k-1, 右子树k+1. level order traverse的同时,多记录一栏track vertical order就好。 每个level用map来装,这样输出的时候自动按从左到右排好了。 面经:print the top view of a binary tree 实现:Time O(nlogn) BFS-n, map-logn S...
原题链接在这里:https://leetcode.com/problems/binary-tree-vertical-order-traversal/ 题目: Given a binary tree, return thevertical ordertraversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the same row and column, the order should be from left...
Similar to level order traversal, but need to use an extra queue to keep track of column number, also a map to keep track of tree nodes in each column class Solution { public List<List<Integer>> verticalOrder(TreeNode root) { if(root == null) return new ArrayList<List<Integer>>(); ...
建立一个TreeColumnNode,包含一个TreeNode,以及一个column value,然后用level order traversal进行计算,并用一个HashMap保存column value以及相同value的点。也要设置一个min column value和一个max column value,方便最后按照从小到大顺序获取hashmap里的值输出。 Java: 1 2 3 4 5 6 7 8 9 10 11 12 13 14...
https://github.com/grandyang/leetcode/issues/314 类似题目: Binary Tree Level Order Traversal 参考资料: https://leetcode.com/problems/binary-tree-vertical-order-traversal/ https://leetcode.com/problems/binary-tree-vertical-order-traversal/discuss/76401/5ms-Java-Clean-Solution ...
链接:http://leetcode.com/problems/binary-tree-vertical-order-traversal/ 题解: 二叉树Vertical order traversal。这道题意思很简单但例子举得不够好,假如上面第二个例子里5还有右子树的话,就会和20在一条column里。总的来说就是假定一个node的column是 i,那么它的左子树column就是i - 1,右子树column就是...
链接:https://leetcode.cn/problems/vertical-order-traversal-of-a-binary-tree 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。 思路 题意跟 314 题非常像,但是 314 只要求我们找到横坐标一样的元素,把他们合成一组;但是这个题的题目描述写的非常不清楚,根据 test case,实际的要求是 ...
314. Binary Tree Vertical Order Traversal https://leetcode.com/problems/binary-tree-vertical-order-traversal/#/description Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the same row and ...
Leetcode-987 Vertical Order Traversal of a Binary Tree(二叉树的垂序遍历) 水过去了(发出了混子的声音 1#definepb push_back2classSolution3{4public:5vector<vector<int> > verticalTraversal(TreeNode*root)6{78vector<vector<int>>rnt;9if(!root)10returnrnt;1112vector<vector<vector<int>>> v(1000,...
思路:level order traversal (BFS) + hash table,ref:https://www.youtube.com/watch?v=PQKkr036wRc 定义horizontal distance: 从root出发,Hd(root) = 0, Hd(左孩子) = Hd(parent) - 1, Hd(右孩子) = Hd(parent) + 1 需要两个hash map,dist记录每个节点的hd, map记录每个dist对应的节点的值。先...