leetcode hard模式专杀1269. Number of Ways to Stay in the Same Place After Some Steps

时间 2020-12-30

标签 leetcode 算法刷题 hard模式繁體版

原文原文链接

题干： https://leetcode.com/problems/number-of-ways-to-stay-in-the-same-place-after-some-steps/ 前言：这题确实TMD有点难。我一开始尝试用动态规划，但是没找好状态转移方程，可能是直觉不太好，然后尝试用回溯法来做。之所以用回溯法，是因为我把每一步的决策看成三选一的决策动作，然后通过决策树的回溯遍历，自然可以

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1. leetcode hard模式专杀1269. Number of Ways to Stay in the Same Place After Some Steps
2. 5 ways to minimize the security risks of the cloud
3. LeetCode 1519. Number of Nodes in the Sub-Tree With the Same Label
4. leetcode hard模式专杀 805. Split Array With Same Average
5. 【Leetcode】【Hard】Valid Number
6. leetcode hard模式专杀之24 Game
7. How to become an iPhone developer in eight easy steps
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9. some fragment of thinking in java part5
10. Invalid update: invalid number of sections. The number of sections contained in the table view afte

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