Ant book practice

Implement some practices in Ant book.

Written in C++, Python.

Name		Name	Last commit message	Last commit date
Latest commit History 26 Commits
2-1		2-1
2-2		2-2
2-3		2-3
2-4/track		2-4/track
2-5		2-5
3-1		3-1
3-2		3-2
3-3/RMQ		3-3/RMQ
.gitignore		.gitignore
README.md		README.md

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