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We give the following inductive definition of a “regular brackets” sequence: the empty sequence is a regular brackets sequence, ifsis a regular brackets sequence, then (s) and [s] are regular brackets sequences, and ifaandbare regular brackets se...

Multiplication Puzzle POJ - 1651 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 number of points equal to the product of the number..