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Permutation tests for large sequences

I would like to perform a permutation test on a particularly large data set, i.e. around 4 million entries. Basically, I need to get some number of random permutations of this data set. Usual way to ...
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Performance of a Skip-List algorithm

Here is a simple code for a randomized skip-list: Coin_Side flip() { if ( random() % 2 == 0 ) return HEADS; else return TAILS; } Note: random() returns an integer that uses ...