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///
/// @file phi_vector.cpp
/// @brief Test that phi_vector(x, a) and phi(x, a)
/// results are identical
///
/// Copyright (C) 2024 Kim Walisch, <kim.walisch@gmail.com>
///
/// This file is distributed under the BSD License. See the COPYING
/// file in the top level directory.
///
#include <primecount.hpp>
#include <generate_primes.hpp>
#include <imath.hpp>
#include <phi_vector.hpp>
#include <PiTable.hpp>
#include <stdint.h>
#include <iostream>
#include <random>
#include <vector>
using std::size_t;
using namespace primecount;
int main()
{
for (int j = 0; j < 100; j++)
{
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_int_distribution<int64_t> dist(0, 1000000);
int64_t x = dist(gen);
int64_t y = isqrt(x) + 1000;
int threads = 1;
PiTable pi(y, threads);
int64_t a = pi[y];
auto primes = generate_primes<int64_t>(y);
auto phi_vect = phi_vector(x, a, primes, pi);
for (size_t i = 1; i < phi_vect.size(); i++)
{
int64_t phi1 = phi_vect[i];
int64_t phi2 = phi(x, i - 1);
if (phi1 != phi2)
{
std::cerr << "Error: phi_vector(x, i - 1) = " << phi1 << std::endl;
std::cerr << "Correct: phi(x, i - 1) = " << phi2 << std::endl;
std::cerr << "x = " << x << std::endl;
std::cerr << "i - 1 = " << i - 1 << std::endl;
std::cerr << "a = " << a << std::endl;
std::exit(1);
}
}
}
std::cout << std::endl;
std::cout << "All tests passed successfully!" << std::endl;
return 0;
}
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