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一 原题 Checker Challenge Examine the 6x6 checkerboard below and note that the six checkers are arranged on the board so that one and only one is placed in each row and each column, and there i

一 原题 The Castle IOI'94 - Day 1 In a stroke of luck almost beyond imagination, Farmer John was sent a ticket to the Irish Sweepstakes (really a lottery) for his birthday. This ticket turned out to

一 原题 Overfencing Kolstad and Schrijvers Farmer John went crazy and created a huge maze of fences out in a field. Happily, he left out two fence segments on the edges, and thus created two "exits"

一 原题 Camelot IOI 98 Centuries ago, King Arthur and the Knights of the Round Table used to meet every year on New Year's Day to celebrate their fellowship. In remembrance of these events, we con

一 原题 Raucous Rockers You just inherited the rights to N (1 <= N <= 20) previously unreleased songs recorded by the popular group Raucous Rockers. You plan to release a set of M (1 <= M <= 20) co

一 原题 Shuttle Puzzle Traditional The Shuttle Puzzle of size 3 consists of 3 white marbles, 3 black marbles, and a strip of wood with 7 holes. The marbles of the same color are placed in the holes

一 原题 Frame Up Consider the following five picture frames shown on an 9 x 8 array: ........ ........ ........ ........ .CCC.... EEEEEE.. ........ ........ ..BBBB.. .C.C.... E....

一 原题 Milk Measuring Hal Burch Farmer John must measure Q (1 Farmer John has always been frugal. He is at the cow hardware store where he must purchase a set of pails with which to measure out Q

一 原题 Twofive IOI 2001 In order to teach her young calvess the order of the letters in the alphabet, Bessie has come up with a game to play with them. The calves are given a 5 x 5 grid on which th

一 原题 Fence Rails Burch, Kolstad, and Schrijvers Farmer John is trying to erect a fence around part of his field. He has decided on the shape of the fence and has even already installed the posts,

一 原题 Cryptcowgraphy Brian Dean The cows of Farmer Brown and Farmer John are planning a coordinated escape from their respective farms and have devised a method of encryption to protect their writ

一 原题 D. Olya and Energy Drinks time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Olya loves energy drinks. S

一 原题 Wisconsin Squares It's spring in Wisconsin and time to move the yearling calves to the yearling pasture and last year's yearlings to the greener pastures of the north 40. Farmer John has

一 原题All Latin SquaresA square arrangement of numbers1 2 3 4 5 2 1 4 5 3 3 4 5 1 2 4 5 2 3 1 5 3 1 2 4 is a 5 x 5 Latin Square because each whole number from 1 to 5 appears once and...

一 原题 Betsy's Tour Don Piele A square township has been divided up into N2 square plots (1 <= N <= 7). The Farm is located in the upper left plot and the Market is located in the lower left plot

一 原题 The Clocks IOI'94 - Day 2 Consider nine clocks arranged in a 3x3 array thusly: |-------| |-------| |-------| | | | | | | | |---O | |---O | |

一. 原题 Mother's Milk Farmer John has three milking buckets of capacity A, B, and C liters. Each of the numbers A, B, and C is an integer from 1 through 20, inclusive. Initially, buckets A and B a