C++ python高斯小學公式解Leetcode 1759 Count Number of Homogenous Substrings

C++ python高斯小學公式解Leetcode 1759  Count Number of Homogenous Substrings

高斯小學公式解1+2+...+n=n(n+1)/2 就 O(1)時間，不用它也行改用迴圈需時O(n)。解Leetcode 1759. Count Number of Homogenous Substrings也很好用，O(n)時間，O(1)空間，如果還要優化，就考慮平行化，這裡似乎有難度，空間就多用點。

[codes on Leetcode]https://leetcode.com/problems/count-number-of-homogenous-substrings/solutions/4266521/c-python-sum-of-n-n-1-2-0-ms-beats-100/

[Leetcode playList]https://www.youtube.com/watch?v=odbN3KooN8s&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

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C++ python  prefix Sum與pyplot圖解打怪問題Leetcode 1921  Eliminate Maximum Number of Monsters

[Leetcode playList]https://www.youtube.com/watch?v=odbN3KooN8s&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

[Codes on Leetcode]https://leetcode.com/problems/eliminate-maximum-number-of-monsters/solutions/4258968/c-o-n-prefix-sum-52ms-beats-100-w-pyplot-fig/

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CPP優先佇列priority queue解Leetcode 1845  Seat Reservation Manager

[Leetcode playList]https://www.youtube.com/watch?v=odbN3KooN8s&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

[Codes on Leetcode]https://leetcode.com/problems/seat-reservation-manager/solutions/4254433/c-priority-queue-vs-set-vs-bool-array-214ms-beats-100/

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[codes on Leetcode]https://leetcode.com/problems/last-moment-before-all-ants-fall-out-of-a-plank/solutions/4246032/c-3-lines-python-1-line-physics/

[Leetcode playlist]https://www.youtube.com/watch?v=dCV4xtEsY1E&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

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python C++遞迴函數解Leetcode779 K th Symbol in Grammar 

[code on Leetcode]https://leetcode.com/problems/k-th-symbol-in-grammar/solutions/4205351/c-c-python-recursion-independent-of-n-one-line-0ms-beats-100/

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