250 Problem Statement

You have two favorite music bands. Each of them has just recorded a new album. You have bought both albums.

You know the durations (in seconds) of songs on each of >>继续阅读

250 Problem Statement

A positive integer is called a prime if it has exactly two distinct positive integer divisors: 1 and itself. The first few primes are 2, 3, 5, 7, 11, 13, ...

A positive integer is called a palindrome if its base-10 represent >>继续阅读

250 Problem Statement

Farmer John recently found out about a popular online farming game.There are n types of plants in the game. The types are numbered 0 through n-1. At the beginning of the game, Farmer John is given one seed of each plant type.T >>继续阅读

A Problem Statement

You are given two distinct points A and B in the two-dimensional plane. Your task is to find any point C with the following properties:

C is different from A and B. >>继续阅读