C++ What is the code below doing? Find the short code can replace its function (For example: sort, replace, search, ...) int* Algorithm1(int limit) { bool* sieve = new bool[limit >> 1]; for (int i = 0; i < sizeof(sieve) / sizeof(sieve[0]); i++) sieve[i] = true; for (int p = 3, s = 9; s < limit; p += 2) { if (sieve[p >> 1]) { for (int q = s; q < limit; q += p << 1) sieve[q >> 1] = false; } s += (p + 1) << 2; } int* primes = new int[sizeof(sieve) / sizeof(sieve[0])]; if (limit > 2) primes[0] = 2; for (int i = 1; i < sieve.size(); ++i) { if (sieve[i]) primes.push_back((i << 1) + 1); } return primes; }

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Randomized Select Algorithm

A randomized algorithm is defined as one that uses a certain amount of randomization in its logic or operation. It is said to be an algorithm that depends on the random number to perform its operation. It is used for reducing the overall time complexity, space complexity in the standard algorithm. The randomized algorithm uses the concept of random numbers to find the solutions to the different kinds of problems and also to improve the problem solutions.