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The Fisher–Yates shuffle is an algorithm for shuffling a finite sequence. The algorithm takes a list of all the elements of the sequence, and continually determines the next element in the shuffled sequence by randomly drawing an element from the list until no elements remain. [1]
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A simple algorithm to generate a permutation of n items uniformly at random without retries, known as the Fisher–Yates shuffle, is to start with any permutation (for example, the identity permutation), and then go through the positions 0 through n − 2 (we use a convention where the first element has index 0, and the last element has index n − 1), and for each position i swap the element ...
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d reads a finite string w and bets money on the next bit. It bets some fraction of its money that the next bit will be 0, and then remainder of its money that the next bit will be 1. d doubles the money it placed on the bit that actually occurred, and it loses the rest. d(w) is the amount of money it has after seeing the string w.
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It iterates over a string trying to find as long a Lyndon word as possible. When it finds one, it adds it to the result list and proceeds to search the remaining part of the string. The resulting list of strings is the standard factorization of the given string. More formal description of the algorithm follows.
Perfect shuffle may refer to: Faro shuffle , in particular the interpretation whereby cards (or more generally, entities in sequence) are divided into two equal piles and interleaved. Any shuffling algorithm that guarantees perfect randomness (all possible orders with equal probability), such as the Fisher–Yates shuffle .