* add dp up - down minimum cost for tickets
* add typints
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* add more tests
* add types for the dp function
* Update dynamic_programming/minimum_tickets_cost.py
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* fix review notes
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* small fix
* Update dynamic_programming/minimum_tickets_cost.py
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* Update dynamic_programming/minimum_tickets_cost.py
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* fix tests
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* Update dynamic_programming/minimum_tickets_cost.py
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