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POJ-3096 Surprising StringsThe D-pairs of a string of letters are the ordered pairs of letters that are distance D from each other. A string is D-unique if all of its D-pairs are different. A string is surp

River Hopscotch Every year the cows hold an event featuring a peculiar version of hopscotch that involves carefully jumping from rock to rock

DryingIt is very hard to wash and especially to dry clothes in winter. But Jane is a very smart girl. She is not afraid of this boring process

Radar Installation Assume the coasting is an infinite straight line. Land is in one side of coasting, sea in the other. Each small island is a

Building a Space Stationdescription：You are a member of the space station engineering team, and are assigned a task in the construction process of the station. You are expected to write a computer prog

Slim Spandescription：Given an undirected weighted graph G, you should find one of spanning trees specified as follows. The graph G is an ordered pair (V, E), where V is a set of vertices {v1, v2, …, v

BracketsDescription:We give the following inductive definition of a “regular brackets” sequence: •the empty sequence is a regular brackets sequence, •if s is a regular brackets sequence, then (s) and

Multiplication Puzzledescription:The multiplication puzzle is played with a row of cards, each containing a single positive integer. During the move player takes one card out of the row and scores the