[置頂]ECDSA

什麼是ECDSA?

Py3 C++奇偶交錯奇偶子數列解Leecode 3201 Find the Maximum Length of Valid Subsequ...

Py3  C++奇偶交錯奇偶子數列解Leecode 3201  Find the Maximum Length of Valid Subsequence I

求最長有效子序列，使得 (sub[0] + sub[1]) % 2 == (sub[1] + sub[2]) % 2 == ... == (sub[x - 2] + sub[x - 1]) % 2，有 3 種可能的情況

-全為偶數

-全為奇數

-或奇偶交錯子序列

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Py3 C++母音 vowel mask速解Leetcode 3136 Valid Word

Py3 C++母音 vowel mask速解Leetcode 3136  Valid Word

Leetcode有許多判斷母音的問題，採用bitmask方式，迅速又方便

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Leetcode has many problems in determining vowels. Using the bitmask method is fast and convenient.

[codes onLeetcode]https://leetcode.com/problems/valid-word/solutions/6959558/bitmask-for-vowel-bitset-beats-100/

C++ Py3 hashmap與binary search解Leetcode 1865 Finding Pairs With a Certain...

C++ Py3 hashmap與binary search解Leetcode 1865 Finding Pairs With a Certain Sum

基本上用 hashmap。解釋為什麼要使用排序和二元搜尋找來優化程式碼

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Basically use hashmap. Explain why  one should use sorting and binary search to optimize the code.

[codes on Leetcode]https://leetcode.com/problems/finding-pairs-with-a-certain-sum/solutions/6925404/unordered-map-sort-binary-search-c-37ms-99-37-py3-97-45/

[Leetcode playlist]https://www.youtube.com/watch?v=LJPL-Ukxf8w&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

Py3 C++位元計算bitset速解Leetcode難題3307 Find the K th Character in String Gam...

Py3 C++位元計算bitset速解Leetcode難題3307  Find the K th Character in String Game II

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Py3排序 C++nth_element速解Leetcode 2099 Find Subsequence of Length K With t...

Py3排序 C++nth_element速解Leetcode 2099  Find Subsequence of Length K With the Largest Sum

C++的nth_element很好用，基本上是做partition，在這個問題可取代sort

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C++'s nth_element is very useful. It basically does partitioning and can replace sort in this problem.

[codes on Leetcode]https://leetcode.com/problems/find-subsequence-of-length-k-with-the-largest-sum/solutions/6893606/nth-element-counting-sort-c-100-py3-1-line/

Py3 C++計數排序counting sort解Leetcode 2294 Partition Array Such That Maximu...

Py3 C++計數排序counting sort解Leetcode 2294  Partition Array Such That Maximum Difference Is K

基本上使用Greedy sort，而排序就用counting sort

[Python C++計數排序與一行解Leetcode 1051 Height Checker]https://www.youtube.com/watch?v=dybiq3pg-Os

[ Leetcode play list]https://www.youtube.com/playlist?list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

2025資訊安全Steganography隱寫術Python實作

Py3 C++ DFS解Leetcode難題1298 Maximum Candies You Can Get from Boxes

Py3 C++ DFS解Leetcode難題1298  Maximum Candies You Can Get from Boxes

[codes on Leetcode]https://leetcode.com/problems/maximum-candies-you-can-get-from-boxes/solutions/6805859/dfs-bfs-for-a-tree-beats-100/

[Tree/graph list]https://www.youtube.com/watch?v=vdar3a_ZdCI&list=PLYRlUBnWnd5Kt0-3un43cwY6yT_il8NWe

C++Py3重複組合排容原理解Leetcode2929 Distribute Candies Among Children II

C++Py3重複組合排容原理解Leetcode2929  Distribute Candies Among Children II

Use combinatorial number with repetition & Inclusion-Exclusion Prinple to solve

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