coco430的专栏

The areaTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6004    Accepted Submission(s): 4193Problem DescriptionIgnatius bought a

Searching for Nessy The Loch Ness Monsteris a mysterious and unidentified animal said to inhabit Loch Ness,  a large deep freshwater loch near the city of Inverness in northern Scotland.

Problem DescriptionIn many applications very large integers numbers are required. Some of these applications are using keys for secure transmission of data, encryption, etc. In this problem you ar

The Land of JusticeInput: standard inputOutput: standard outputTime Limit: 4 secondsIn the Land of Justice the selling price of everything is fixed all over the country. Nobody can buy a t

Steps One steps through integer points of the straight line. The length of a step must be nonnegative and can be by one bigger than, equal to, or by one smaller than the length of the

Box of Bricks Little Bob likes playing with his box of bricks. He puts the bricks one upon another and builds stacks of different height. ``Look, I've built a wall!'', he tells his old

The Snail A snail is at the bottom of a 6-foot well and wants to climb to the top. The snail can climb 3 feet while the sun is up, but slides down 1 foot at night while sleeping. The s

Ant on a Chessboard  Background  One day, an ant called Alice came to an M*M chessboard. She wanted to go around all the grids. So she began to walk along the chessboard according to t

Power of Cryptography BackgroundCurrent work in cryptography involves (among other things) large prime numbers and computing powers of numbers modulo functions of these primes.

The ? 1 ? 2 ? ... ? n = k problem The problemGiven the following formula, one can set operators '+' or '-' instead of each '?', in order to obtain a given k? 1 ? 2 ? ... ? n

Secret Research At a certain laboratory results of secret research are thoroughly encrypted. A result of a single experiment is stored as an information of its completion:`po

Cube painting We have a machine for painting cubes. It is supplied with three different colors: blue, red and green. Each face of the cube gets one of these colors. The cube's faces ar

Rightmost DigitTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 24345    Accepted Submission(s): 9291Problem DescriptionGiven a p

How Many Points of Intersection? We have two rows. There are a dots on the top row and b dots on the bottom row. We draw line segments connecting every dot on the top row with every do