[React] Hooks
IntroductionAvailable after react 16.8
React Hooks are used in functional components to manage state.
useState returns an array with exactly two elem
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[Javascript] Closure, Bind, Apply
ClosureAn inner function has always access to the variables and parameters of its outer function, even after the outer function has returned.
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[Leetcode] Union Find
IntroductionVideo: https://www.youtube.com/watch?v=0jNmHPfA_yE&t=59sChinese Video: https://www.youtube.com/watch?v=VJnUwsE4fWA
Find(x) Find the ro
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[Leetcode] Bit Manipulation
IntroductionVideo: https://www.youtube.com/watch?v=NLKQEOgBAnw&t=189s
Two’s Complement
Notes: https://www.cs.cornell.edu/~tomf/notes/cps104/twosco
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[Leetcode] Stack
1047. Remove All Adjacent Duplicates In StringLeetcode: https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string/
12345678def removeDupl
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[Leetcode] Matrix
48. Rotate ImageMatrix Rotation ProblemsSolution Template
123456789101112131415/* * clockwise rotate * first reverse up to down, then swap the symmetr
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[Leetcode] Two Pointers in Array
Two Pointers in One Array15. 3SumLeetcode: https://leetcode.com/problems/3sum/
Note:
Sort array (to conveniently jump over duplicates)
Use i as the m
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[Leetcode] Binary Indexed Tree
Used to solve prefix sum problems. Why use BIT: can calculate prefix sums and update the sum with O(logn) efficiency.
Construct a BIT from a int array
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[Docker] Volume and Network
Docker VolumeData PersistenceContainers were meant and designed for stateless workloads and the design of the container layers shows that.
A Docker im
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[Unix]Basic and Commands
Unix Operating SystemThe KernelThe kernel of UNIX is the hub of the operating system:
it allocates time and memory to programs
handles the filestore
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