Problem Description Find and list all four-digit numbers in decimal notation that have the property that the sum of its four digits equals the sum of its digi...

Problem Description Computer simulations often require random numbers. One way to generate pseudo-random numbers is via a function of the form

Problem Description === Op tech briefing, 2002/11/02 06:42 CST === “The item is locked in a Klein safe behind a painting in the second-floor library. Klein ...

Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2, …, n into each circle separately, and the sum of numbers in t...

Problem Description Give you two numbers A and B, if A is equal to B, you should print “YES”, or print “NO”.

Problem Description Given a two-dimensional array of positive and negative integers, a sub-rectangle is any contiguous sub-array of size 1 x 1 or greater loca...

Problem Description A DFS(digital factorial sum) number is found by summing the factorial of every digit of a positive integer.

Problem Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in which he made the following conjecture: ...

Have the function MissingDigit(str) take the str parameter, which will be a simple mathematical formula with three numbers, a single operator (+, -, *, or /) an...

Copying Books POJ - 1505 Before the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so...