py3 C C++階乘模運算速解Leetcode 3577 Count the Number of Computer Unlocking Pe...

py3 C C++階乘模運算速解Leetcode 3577  Count the Number of Computer Unlocking Permutations

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Py3 C++利用Euclid公式達O(n)解Leetcode1925 Count Square Sum Triples

Py3 C++利用Euclid公式達O(n)解Leetcode 1925  Count Square Sum Triples

用數論方法解畢氏定理三角整數解個數，這應該算是Diophantine  Equation中最簡單的例題

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Py3 C++ hashmap多項次公式解梯形問題Leetcode 3623 Count Number of Trapezoids I

Py3 CPP多項次公式解梯形問題Leetcode 3623  Count Number of Trapezoids I

數有幾個不同水平梯形，先用hash map數有相同y座標的點，再用多項次公式解題

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Py3 C C++ prefix sum解Leetcode 3381 Maximum Subarray Sum With Length Div...

Py3 C C++ prefix sum解Leetcode 3381  Maximum Subarray Sum With Length Divisible by K

Very similar to Kadane's algorithm

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Py3 C++找出pattern迭代變化解出Leetcode 1015 Smallest Integer Divisible by K

所謂的數論問題，也不一定是是像費馬定理那樣的大問題，能找出數字間的pattern也都是值得玩味的

執行直到 r=(10*r+1)%k==0（其中 k 與 2 和 5 互質），否則返回 -1

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AI人工智慧Keras實作神經網路模型之mnist手寫數字辨識

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C++用 -1 mask法達到branchless解Leetcode1513 Number of Substrings With Only 1...

C++用 -1 mask法達到branchless解Leetcode1513  Number of Substrings With Only 1s|Py3 1-liner

其實很容易，想練功，試試一行解，或是把if分岔拿掉

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Py3 C++ 2D sweep解Leetcode 2536 Increment Submatrices by One

Py3 C++ 2D sweep解Leetcode 2536  Increment Submatrices by One

使用2D掃描，方法為line sweep的2D推廣，方便好用。

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C++ Py3 Euclidean Algorithm解Leetcode 2169 Count Operations to Obtain Zero

C++ Py3 Euclidean Algorithm解Leetcode 2169  Count Operations to Obtain Zero

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Py3 C++導出遞迴公式解難題Leetcode1611 Minimum One Bit Operations to Make Integer...

Py3 C++導出遞迴公式解難題Leetcode1611  Minimum One Bit Operations to Make Integers Zero從導出公式到寫出code，一次完成解Leetcode難題

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