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#include "../util.h"
#include <string/rollingHash.cpp>
string thueMorse(ll n) {
string res = "a";
while (ssize(res) < n) {
string tmp = res;
for (char& c : tmp) c ^= 1;
res += tmp;
}
return res;
}
auto getHash(const string& s) {
return Hash(s)(0, ssize(s));
}
void testThueMorse() {
set<decltype(getHash(""))> got;
set<string> expected;
string s = thueMorse(1000);
Hash h(s);
for (int l = 0; l < ssize(s); l++) {
for (int r = l + 1; r <= ssize(s); r++) {
got.insert(h(l, r));
expected.insert(s.substr(l, r - l));
}
}
if (ssize(got) != ssize(expected)) cerr << "error: thueMorse" << FAIL;
cerr << "thueMorse: ok" << endl;
}
void testTiny() {
if (getHash("aa") == getHash("a")) cerr << "error: tiny" << FAIL;
if (getHash("00") == getHash("0")) cerr << "error: tiny" << FAIL;
if (getHash("AA") == getHash("A")) cerr << "error: tiny" << FAIL;
cerr << "tiny: ok" << endl;
}
void testSmall(int depth) {
set<decltype(getHash(""))> got;
ll expected = 0;
auto dfs = [&](auto&& self, string pref)->void {
expected++;
got.insert(getHash(pref));
if(ssize(pref) >= depth) return;
for (char c = 'a'; c <= 'z'; c++) {
self(self, pref + c);
}
};
dfs(dfs, "");
if (ssize(got) != expected) cerr << "error: small" << FAIL;
cerr << "small: ok" << endl;
}
void stress_test() {
set<decltype(getHash(""))> got;
set<string> expected;
string s = Random::string(1000, "abc");
Hash h(s);
for (int l = 0; l < ssize(s); l++) {
for (int r = l + 1; r <= ssize(s); r++) {
got.insert(h(l, r));
expected.insert(s.substr(l, r - l));
}
}
if (ssize(got) != ssize(expected)) cerr << "error: stress test" << FAIL;
cerr << "stress test: ok" << endl;
}
constexpr int N = 1'000'000;
void performance_test() {
timer t;
auto s = Random::string(N, "a") + Random::string(N, "ab") + Random::string(N, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$#");
hash_t hash = 0;
t.start();
Hash h(s);
for (ll i = 0; i < N; i++) {
hash += h(i, i + 2*N);
}
t.stop();
if (t.time > 500) cerr << "too slow: " << t.time << FAIL;
cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
}
int main() {
testThueMorse();
testTiny();
testSmall(sanitize ? 4 : 5);
stress_test();
if (!sanitize) performance_test();
}
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