2415
[LeetCode] 2415. Reverse Odd Levels of Binary Tree
Given the root of a perfect binary tree, reverse the node values at each odd level of the tree. For example, suppose the node values at level 3 are [2 ......
P2415 集合求和
1.题目介绍 2.题解 至于为何\(C_{3}^{0}+C_{3}^{1}+C_{3}^{2}+C_{3}^{3} = 2^{3}\) 可以使用数学归纳法: 1.对于\(C_{0}^{0} = 2^0\) 2.假设对于n = k,\(C_{k}^{0}+C_{k}^{1}+C_{k}^{2}+... ......