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#include "../util.h"
#include <string/ahoCorasick.cpp>
vector<ll> naive(string s, vector<string> patterns) {
vector<ll> ans(patterns.size());
for (int k = 0; k < (int)patterns.size(); k++) {
string pattern = patterns[k];
for (int i = 0; i + pattern.size() <= s.size(); i++) {
if (s.substr(i, pattern.size()) == pattern) ans[k]++;
}
}
return ans;
}
vector<ll> normal(string s, vector<string> patterns) {
AhoCorasick aho;
vector<int> ind(patterns.size());
for (int i = 0; i < (int)patterns.size(); i++) {
ind[i] = aho.addString(patterns[i]);
}
aho.buildGraph();
int v = 0;
for (char c : s) v = aho.go(v, c - OFFSET), aho.dp[v]++;
aho.dfs();
vector<ll> ans(patterns.size());
for (int i = 0; i < (int)patterns.size(); i++) {
ans[i] = aho.dp[ind[i]];
}
return ans;
}
void stress_test() {
ll queries = 0;
for (int i = 0; i < 100; i++) {
int n = Random::integer(1, 100);
string s = Random::string(n, "abc");
int m = Random::integer(1, 100);
vector<string> patterns(m);
for (string& e : patterns) {
int k = Random::integer(1, 100);
e = Random::string(k, "abc");
}
auto got = normal(s, patterns);
auto expected = naive(s, patterns);
if (got != expected) cerr << "Wrong Answer" << FAIL;
queries++;
}
cerr << "Tested random queries: " << queries << endl;
}
constexpr int N = 1'000'000;
void performance_test() {
timer t;
string s = string(N, 'a') + Random::string(N, "ab");
vector<string> patterns = {"a"};
for (int sm = 1; sm < N; sm += patterns.back().size()) {
patterns.emplace_back(patterns.back().size()+1, 'a');
}
for (int i = 0; i < 100; i++) {
patterns.emplace_back(Random::string(N/100, "ab"));
}
t.start();
hash_t hash = normal(s, patterns)[0];
t.stop();
if (t.time > 500) cerr << "Too slow: " << t.time << FAIL;
cerr << "Tested performance: " << t.time << "ms (hash: hash " << hash << ")" << endl;
}
int main() {
stress_test();
performance_test();
}
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