Why learn to use Big O? Use Big O to measure how and why one data structure is better than others. Why do we use an array rather than an object in some cases? Each data structure has pros and cons. Big O is used to describe how efficiently the code r...
The space means additional space. This space doesn’t care how much size the input is. Memory Heap: store variables we assigned Stack: keep track of the function calls What takes memory space? Variables Data Structures Function Call Allocations ...
跟課堂範例會略有不同，課堂範例程式碼是以JavaScript示範，以下筆記是改寫成Go的版本 What is good code? Readable Scalable: Big O can measure it Big O: How long does the algorithm take to run? When talking about Big O, it is about when the input grows bigger and bigger, how much time ...
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前置作業： create students table with many columns and insert multiple dummy data postgres=# create table students ( id serial primary key, g int, firstname text, lastname text, middlename text, address text, bio text, dob date, id1 int, id2 int, id3 i...
前置作業： Create grades table and add an index to g column. postgres=# create table grades( id serial primary key, name text, g int, firstname text, lastname text, address text, bio text ); create index g_idx on grades(g) include (id); Check table stru...