ivyChen的专栏

DescriptionCurrent work in cryptography involves (among other things) large prime numbers and computing powers of numbers among these primes. Work in this area has resulted in the practical use of

DescriptionA network of m roads connects N cities (numbered from 1 to N). There may be more than one road connecting one city with another. Some of the roads are paid. There are two ways to pay fo

DescriptionYou are given two pots, having the volume of A and B liters respectively. The following operations can be performed:FILL(i)        fill the pot i (1 ≤ i ≤ 2) from the tap;DROP(i)   

DescriptionA common pastime for poker players at a poker table is to shuffle stacks of chips. Shuffling chips is performed by starting with two stacks of poker chips, S1 and S2, each stack contain

DescriptionRoger Wilco is in charge of the design of a low orbiting space station for the planet Mars. To simplify construction, the station is made up of a series of Airtight Cubical Modules (ACM

DescriptionImagine you are attending your math lesson at school. Once again, you are bored because your teacher tells things that you already mastered years ago (this time he's explaining that (a+

DescriptionThe ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices. — It i

Time Limit: 2000MS Memory Limit: 65536KTotal Submissions: 44494 Accepted: 13904DescriptionFarmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He

DescriptionAn array of size n ≤ 106 is given to you. There is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the wi

DescriptionBackground The knight is getting bored of seeing the same black and white squares again and again and has decided to make a journey around the world. Whenever a knight moves, it is

Time Limit: 1000MS Memory Limit: 65536KTotal Submissions: 9939 Accepted: 4313DescriptionThe cornfield maze is a popular Halloween treat. Visitors are shown the entrance and