Name	Name	Last commit message	Last commit date
parent directory ..
Solution.playground	Solution.playground
Makefile	Makefile
README.md	README.md
Solution.swift	Solution.swift
main.cpp	main.cpp

Name

Last commit message

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Count of 2s

Write a method to count the number of 2s that appear in all the numbers between 0 and n. Example Input: 25 Output: 9 (2, 12, 20, 21, 22, 23, 24, 25)

Solutions:

O(n)

O(n)

Run make to build and run C++ files and run Swift files. Or you can run .playground file.