An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself. For example, 153 is an Armstrong number since 1^3 + 5^3 + 3^3 = 153.
Get the area codes from a list of phone numbers
Knight's Tour Checker
Column norms of a matrix
Flip the main diagonal of a matrix
CONVERT TAN TO SIN
Given a 4x4 matrix, swap the two middle columns
Find the logic
match 2 string
give-nth-decimal-place-of-pi up to 100 digits
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