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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
1186 changed files with 381859 additions and 0 deletions
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33
lib/luby.cpp Normal file
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/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
luby.cpp
Abstract:
<abstract>
Author:
Leonardo de Moura (leonardo) 2008-03-04.
Revision History:
--*/
#include<cmath>
unsigned get_luby(unsigned i) {
if (i == 1)
return 1;
double k = log(static_cast<double>(i+1))/log(static_cast<double>(2));
if (k == floor(k + 0.5))
return static_cast<unsigned>(pow(2,k-1));
else {
k = static_cast<unsigned>(floor(k));
return get_luby(i - static_cast<unsigned>(pow(2, k)) + 1);
}
}