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#include "../util.h"
#include <string/kmp.cpp>
vector<int> naive(string_view s) {
vector<int> res(ssize(s) + 1, -1);
for (int i = 0; i < ssize(s); i++) {
for (int j = 0; j <= i; j++)
if (s.substr(0, j) == s.substr(i-j+1, j))
res[i+1] = j;
}
return res;
}
void stress_test_preprocessing() {
ll queries = 0;
for (int tries = 0; tries < 100'000; tries++) {
int n = Random::integer<int>(1, 15);
auto s = Random::string(n, "abc");
auto got = kmpPreprocessing(s);
auto expected = naive(s);
if (got != expected) cerr << " error" << FAIL;
queries += n;
}
cerr << " tested random queries: " << queries << endl;
}
constexpr int N = 10'000'000;
void performance_test_preprocessing() {
timer t;
auto s = Random::string(N, "a") + Random::string(N, "ab") + Random::string(N, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$#");
t.start();
auto res = kmpPreprocessing(s);
t.stop();
hash_t hash = 0;
for (int x : res) hash += x;
if (t.time > 500) cerr << " too slow: " << t.time << FAIL;
cerr << " tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
}
vector<int> naive(string_view s, string_view sub) {
vector<int> res;
auto pos = s.find(sub);
while (pos != string_view::npos) {
res.push_back(pos);
pos = s.find(sub, pos + 1);
}
return res;
}
void stress_test_kmp() {
ll queries = 0;
auto a = Random::string(10'000, "abc");
for (int tries = 0; tries < 10'000; tries++) {
int n = Random::integer<int>(1, 10);
auto b = Random::string(n, "abc");
auto got = kmpSearch(a, b);
auto expected = naive(a, b);
if (got != expected) cerr << " error" << FAIL;
queries += got.size();
}
cerr << " tested random queries: " << queries << endl;
}
void performance_test_kmp() {
timer t;
auto s = Random::string(N, "a") + Random::string(N, "ab") + Random::string(N, "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$#");
auto sub1 = Random::string(N/2, "a");
auto sub2 = Random::string(N/2, "ab");
hash_t hash = 0;
t.start();
hash += kmpSearch(s, sub1).size();
hash += kmpSearch(s, sub2).size();
t.stop();
if (t.time > 500) cerr << " too slow: " << t.time << FAIL;
cerr << " tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
}
int main() {
cerr << "preprocessing:" << endl;
stress_test_preprocessing();
if (!sanitize) performance_test_preprocessing();
cerr << "kmp:" << endl;
stress_test_kmp();
if (!sanitize) performance_test_kmp();
}
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