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• luby.cpp

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z3-z3-4.13.0.src.util.luby.cpp Maven / Gradle / Ivy

/*++
Copyright (c) 2006 Microsoft Corporation

Module Name:

    luby.cpp

Abstract:

    

Author:

    Leonardo de Moura (leonardo) 2008-03-04.

Revision History:

--*/
#include

unsigned get_luby(unsigned i) {
    if (i == 1) 
        return 1;
    double k = log(static_cast(i+1))/log(static_cast(2));
    
    if (k == floor(k + 0.5))
        return static_cast(pow(2,k-1));
    else {
        k = static_cast(floor(k));
        return get_luby(i - static_cast(pow(2, k)) + 1);
    }
}