By Dr Antonio Gulli

ISBN-10: 1495330729

ISBN-13: 9781495330728

Bits is the second one of a sequence of 25 Chapters dedicated to algorithms, challenge fixing, and C++ programming. This ebook is ready low point bit programming

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**Additional info for A Collection of Bit Programming Interview Questions solved in C++**

**Example text**

As final step the two intermediate lists are juxtaposed to create the new list. This process is repeated until we generate. size(); i++) std::cout << gray[i] << std::endl; } 25. Represent unsigned integers with variable length encoding using the continuation bit Solution The key idea is to take a 64bit unsigned integer and represent it with a list of bytes. For each byte seven bits are used for storing the integers with variable length encoding. In addition the most significant bit is the continuation bit and it is used to signal whether or not we need an additional byte for encoding n.

Code Left as exercise. 11. Given an array of integers where all the numbers are appearing twice find the only two numbers which appears once Solution XOR-ing all the numbers produces as result the number where and are the only two numbers which appear once. Let be the first bit set to 1 in We can partition all the numbers into sets: the numbers having the bit set to 1 and the numbers having it set to 0. Clearly n1 and n2 cannot be in the same set. So the solution of this problem has been reduced to the solution of the previous problem.

Convert a number from base b1 to base b2 Solution We can generalize the solution presented in the previous exercise. empty()) return s; bool negative = (s[0] == '-'); int n = 0, reminder; for (unsigned int i = (negative ? size(); ++i) n = n * b1 + (isdigit(s[i]) ? push_back(reminder >= 10 ? end()); return result; } 22. Given a set S, compute the powerset of S Solution The powerset of is the set of all the subsets of S. For instance given the set ,the powerset is . If we represent the presence (absence) of element in with a bit set to 1 (respectively, 0), then we can build the powerset by generating all the bitmasks from 0 to where is the size of.