Write a program to find the nth super ugly number.

Andrew has just made a breakthrough in sociology: he realized how to predict whether two persons will be good friends or not. It turns out that each person has ...

Nearly prime number is an integer positive number for which it is possible to find such primes P1 and P2 that given number is equal to P1*P2. There is given a s...

The Fibonacci sequence of numbers is known: F1 = 1; F2 = 1; Fn+1 = Fn + Fn-1, for n>1. You have to find S - the sum of the first K Fibonacci numbers.

You are given natural numbers a and b. Find a^b-b^a.

Given an integer n, return 1 - n in lexicographical order.

Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target.

CIA has decided to create a special telephone directory for its agents. The first 2 pages of the directory contain the name of the directory and instructions fo...

Suppose you are given the following code:

Write a program that outputs the string representation of numbers from 1 to n, however: