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.
Alphabetize by last name
surface of a spherical planet
Permute diagonal and antidiagonal
Generate a string like abbcccddddeeeee
Will there be a new leader?
given 4x4 matrix swap the two middle columns
Simple date to serial no. conversion
match 2 string
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