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#include "../util.h"
#include <math/divSum.cpp>
ll naive(ll n, ll m, ll a, ll b){
ll ans = 0;
for(ll i = 0; i < n; i++){
ans += (a*i+b)/m;
}
return ans;
}
void stress_test() {
ll queries = 0;
for (ll i = 0; i < 10'000; i++) {
int n = Random::integer<int>(1, 100);
int m = Random::integer<int>(1, 100);
int a = Random::integer<int>(0, 100);
int b = Random::integer<int>(0, 100);
ll expected = naive(n, m, a, b);
ll got = divSum(n, m, a, b);
if (got != expected) cerr << "got: " << got << ", expected: " << expected << FAIL;
queries++;
}
cerr << "tested queries: " << queries << endl;
}
constexpr int N = 1'000'000;
void performance_test() {
timer t;
hash_t hash = 0;
for (int operations = 0; operations < N; operations++) {
ll n = Random::integer<ll>(1, 1'000'000'000);
ll m = Random::integer<ll>(1, 1'000'000'000);
ll a = Random::integer<ll>(0, 1'000'000'000);
ll b = Random::integer<ll>(0, 1'000'000'000);
t.start();
hash += divSum(n, m, a, b);
t.stop();
}
if (t.time > 750) cerr << "too slow: " << t.time << FAIL;
cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
}
int main() {
stress_test();
if (!sanitize) performance_test();
}
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