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///
/// @file sieve2.cpp
/// @brief Test the return value of Sieve::cross_off(prime)
/// which returns the number of multiples of prime
/// that have been crossed off for the first time in
/// the sieve array.
///
/// Copyright (C) 2025 Kim Walisch, <kim.walisch@gmail.com>
///
/// This file is distributed under the BSD License. See the COPYING
/// file in the top level directory.
///
#include <Sieve.hpp>
#include <generate_primes.hpp>
#include <imath.hpp>
#include <stdint.h>
#include <iostream>
#include <cstdlib>
#include <vector>
#include <random>
using std::size_t;
using namespace primecount;
void check(bool OK)
{
std::cout << " " << (OK ? "OK" : "ERROR") << "\n";
if (!OK)
std::exit(1);
}
int main()
{
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<int> dist(1000000, 2000000);
int low = 0;
int high = dist(gen);
int sqrt_high = isqrt(high);
auto primes = generate_primes<int32_t>(sqrt_high);
uint64_t segment_size = high - low;
segment_size = Sieve::align_segment_size(segment_size);
Sieve sieve(low, segment_size, primes.size());
std::vector<int> sieve2(high, 1);
sieve2[0] = 0;
for (size_t i = 1; i < primes.size(); i++)
{
uint64_t cnt1 = 0;
uint64_t cnt2 = 0;
uint64_t total1 = 0;
uint64_t total2 = 0;
if (primes[i] <= 5)
{
sieve.pre_sieve(primes, i, low, high);
sieve.init_counter(low, high);
}
else
{
uint64_t prev_count = sieve.get_total_count();
sieve.cross_off_count(primes[i], i);
cnt1 = prev_count - sieve.get_total_count();
total1 = sieve.count(high - 1);
}
for (int j = primes[i]; j < high; j += primes[i])
{
cnt2 += sieve2[j];
sieve2[j] = 0;
}
for (int j = 0; j < high; j++)
total2 += sieve2[j];
if (primes[i] > 5)
{
std::cout << "sieve.cross_off_count(" << i << ", " << primes[i] << ") = " << cnt1;
check(cnt1 == cnt2);
std::cout << "sieve.count(" << high - 1 << ") = " << total1;
check((total1 == total2) && (total2 == sieve.get_total_count()));
}
}
std::cout << std::endl;
std::cout << "All tests passed successfully!" << std::endl;
return 0;
}
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