What is the difference between NCHAR, CHAR, NVARCHAR and VARCHAR

What is the difference between NCHAR, CHAR, NVARCHAR and VARCHAR

A good information with explanation is found here
http://www.sql-server-helper.com/faq/data-types-p01.aspx

See how you would solve these known algorithm problems

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binary tree problems with solution

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Find the first occurence of number in the sorted array

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