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

Find the first occurence of number in the sorted array

Implement Queue Using two Stacks – JavaScript algorithm

Find K Complementary numbers from array Java implementation

Check if there are three numbers a, b, c giving a total T from array A

Check if two strings are anagrams or not

String Ordered Permutation Algorithm Problem

testing k complementary pairs algorithm with junit

Kadane’s algorithm in C – Dynamic Programming

find longest word in the sentence

Java solution for checking anagram strings – tell if phrases are anagrams