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Backtracking

Reorder Routes to Make All Paths Lead to the City Zero

Shopping Offers

Splitting a String Into Descending Consecutive Values

Successful Pairs of Spells and Potions

Walls and Gates

Find Unique Binary String

The k-th Lexicographical String of All Happy Strings of Length n

Letter Tile Possibilities

Find the Punishment Number of an Integer

Amount of New Area Painted Each Day

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