Compute Factorial Digit Sum: Find the sum of the digits in the number 100!
n! means n × (n − 1) × … × 3 × 2 × 1 For example, 10! = 10 × 9 × … × 3 × 2 × …
Compute the Maximum Integer Right Triangles Solutions
If p is the perimeter of a right angle triangle with integral length sides, {a,b,c}, there are exactly three solutions for p = 120. {20,48,52}, {24,45,51}, {30,40,50} For which …
Power Digit Sum: What is the sum of the digits of the number 2^1000?
215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26. What is the sum of the digits of …
Digit factorials: Find the Sum of All the Curious Numbers
145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to …
Computing the Longest Recurring Cycle in its Decimal Fraction Part
A unit fraction contains 1 in the numerator. The decimal representation of the unit fractions with denominators 2 to 10 are given: 1/2 = 0.5 1/3 = 0.(3) 1/4 …
How to Use Priority Queue in Java or C++ to Compute Last Stone Weight?
We have a collection of stones, each stone has a positive integer weight. Each turn, we choose the two heaviest stones and smash them together. Suppose the stones have …