sigongzi

摘要： 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 ea 阅读全文

摘要： Consider nine clocks arranged in a 3x3 array thusly: The goal is to find a minimal sequence of moves to return all the dials to 12 o'clock. Nine diffe 阅读全文

摘要： 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 阅读全文

摘要： A closed fence in the plane is a set of non-crossing, connected line segments with N corners (3 < N < 200). The corners or vertices are each distinct 阅读全文

摘要： Farmer John has decided to construct electric fences. He has fenced his fields into a number of bizarre shapes and now must find the optimal place to 阅读全文

摘要： A square arrangement of numbers is a 5 x 5 Latin Square because each whole number from 1 to 5 appears once and only once in each row and column. Write 阅读全文

摘要： In the square below, each row, each column and the two diagonals can be read as a five digit prime number. The rows are read from left to right. The c 阅读全文

摘要： 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 4 阅读全文

摘要： [International readers should note that some words are puns on cows.] Having made a fortune on Playbov magazine, Hugh Heifer has moved from his origin 阅读全文

摘要： 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 prot 阅读全文

摘要： 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, bu 阅读全文

摘要： Four rectangles are given. Find the smallest enclosing (new) rectangle into which these four may be fitted without overlapping. By smallest rectangle, 阅读全文

摘要： Shaping Regions N opaque rectangles (1 <= N <= 1000) of various colors are placed on a white sheet of paper whose size is A wide by B long. The rectan 阅读全文

摘要： It is said that if you give an infinite number of cows an infinite number of heavy-duty laptops (with very large keys), that they will ultimately prod 阅读全文

摘要： Farmer John is stuck with another problem while feeding his cows. All of his N (1 ≤ N ≤ 100,000) cows (numbered 1..N) are lined up in front of the bar 阅读全文

摘要： A Rectangular Barn Ever the capitalist, Farmer John wants to extend his milking business by purchasing more cows. He needs space to build a new barn f 阅读全文

摘要： Postal Vans Tiring of their idyllic fields, the cows have moved to a new suburb. The suburb is a rectangular grid of streets with a post office at its 阅读全文

摘要： A number, N (1 <= N < 5000), of rectangular posters, photographs and other pictures of the same shape are pasted on a wall. Their sides are all vertic 阅读全文

摘要： Hidden Password Sometimes the programmers have very strange ways of hiding their passwords. Billy "Hacker" Geits chooses a string S composed of L (5 < 阅读全文

摘要： 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 阅读全文