Given n points on a 2D plane, find the maximum number of points that lie on the same straight line.

There are N children standing in a line. Each child is assigned a rating value.

Given a text file file.txt, print just the 10th line of the file.

Once in a forest, there lived N aggressive monkeys. At the beginning, they each does things in its own way and none of them knows each other. But monkeys can’t ...

Find all pairs of prime numbers (A, B) such that A<=B and their sum is also a prime number and does not exceed N.

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.

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...

The sequence of non-negative integers A1, A2, …, AN is given. You are to find some subsequence Ai1, Ai2, …, Aik (1 <= i1 < i2 < … < ik <= N) such, that Ai1 XOR ...

Let f(n) be a sum of digits for positive integer n. If f(n) is one-digit number then it is a digital root for n and otherwise digital root of n is equal to digi...

Given n non-negative integers a1, a2, …, an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line...