Big O notation is used in Computer Science to describe the performance or complexity of an algorithm. Big O specifically describes the worst-case scenario and can be used to describe the execution time required or the space used (e.g. in memory or on disk) by an algorithm.
-Big Os
O(1) Constant- no loops
O(log N) Logarithmic- usually searching algorithms have log n if they are sorted (Binary Search)
O(n) Linear- for loops, while loops through n items
O(n log(n)) Log Liniear- usually sorting operations
O(n^2) Quadratic- every element in a collection needs to be compared to ever other element. Two
nested loops
O(2^n) Exponential- recursive algorithms that solves a problem of size N
O(n!) Factorial- you are adding a loop for every element
Iterating through half a collection is still O(n)
Two separate collections: O(a * b)
-What can cause time in a function?-
Operations (+, -, *, /)
Comparisons (<, >, ==)
Looping (for, while)
Outside Function call (function())
Operations (+, -, *, /)
Comparisons (<, >, ==)
Looping (for, while)
Outside Function call (function())
-Rule Book
Rule 1: Always worst Case
Rule 2: Remove Constants
Rule 3: Different inputs should have different variables. O(a+b). A and B arrays nested would be
O(a*b)
+ for steps in order
* for nested steps
Rule 4: Drop Non-dominant terms
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