1926. Nearest Exit from Entrance in Maze
1926. Nearest Exit from Entrance in Maze
這個問題屬於 BFS 的問題
Tree
1992. Find All Groups of Farmland
1992. Find All Groups of Farmland
class Solution:
def findFarmland(
1302. Deepest Leaves Sum
1302. Deepest Leaves Sum
# Definition for a binary tree node.
938. Range Sum of BST
938. Range Sum of BST
這個題目雖然是簡單，但應該只是實作簡單，真的寫起來不是這麼好想。
我的第一個想法是利用 BST
270. Closest Binary Search Tree Value
270. Closest Binary Search Tree Value
這個題目被標記為簡單是因為這個題目存在著一個簡單的解法，但是這個題目存在一個更優解，這個更優解就很難想得到。
簡單的解法是，
103. Binary Tree Zigzag Level Order Traversal
103. Binary Tree Zigzag Level Order Traversal
# Definition for a
515. Find Largest Value in Each Tree Row
515. Find Largest Value in Each Tree Row
題目要熟悉 BFS
1026. Maximum Difference Between Node and Ancestor
1026. Maximum Difference Between Node and Ancestor
這題要找的是 「某個節點與它的祖先節點之間的差異最大值」。節點的選擇可以是樹中的任何一點，
298. Binary Tree Longest Consecutive Sequence
298. Binary Tree Longest Consecutive Sequence
參考：257. Binary Tree
129. Sum Root to Leaf Numbers
129. Sum Root to Leaf Numbers
請參考 257. Binary Tree