1 files changed, 75 insertions, 0 deletions
diff --git a/test/datastructures/lichao.cpp b/test/datastructures/lichao.cpp
new file mode 100644
index 0000000..f4b797b
--- /dev/null
+++ b/test/datastructures/lichao.cpp
@@ -0,0 +1,75 @@
+#include "../util.h"
+constexpr ll INF = LL::INF;
+#include <datastructures/lichao.cpp>
+
+void stress_test(ll range) {
+	ll queries = 0;
+	for (int tries = 0; tries < 1000; tries++) {
+		int n = Random::integer<int>(1, 100);
+		xs = Random::distinct<ll>(n, -range, range);
+		sort(all(xs));
+
+		vector<ll> naive(n, INF);
+		Lichao tree;
+
+		for (int operations = 0; operations < 1000; operations++) {
+			{
+				ll m = Random::integer<ll>(-100, 100);
+				ll c = Random::integer<ll>(-range, range);
+				ll l = Random::integer<ll>(-range, range);
+				ll r = Random::integer<ll>(-range, range);
+				Fun f{m, c};
+
+				tree.segmentInsert(f, l, r);
+				for (int i = 0; i < n; i++) {
+					if (l <= xs[i] && xs[i] < r) naive[i] = min(naive[i], f(i));
+				}
+			}
+			{
+				queries++;
+				int i = Random::integer<int>(0, n);
+				ll got = tree.query(xs[i]);
+				ll expected = naive[i];
+				if (got != expected) cerr << xs[i] << endl;
+				if (got != expected) cerr << "got: " << got << ", expected: " << expected << FAIL;
+			}
+		}
+	}
+	cerr << "tested random queries: " << queries << endl;
+}
+
+constexpr int N = 200'000;
+void performance_test() {
+	timer t;
+	xs = Random::distinct<ll>(N, -1'000'000'000, 1'000'000'000);
+	sort(all(xs));
+
+	t.start();
+	Lichao tree;
+	t.stop();
+
+	hash_t hash = 0;
+	for (int operations = 0; operations < N; operations++) {
+
+		ll m = Random::integer<ll>(-1'000'000, 1'000'000);
+		ll c = Random::integer<ll>(-1'000'000, 1'000'000);
+		ll l = Random::integer<ll>(-1'000'000'000, 1'000'000'000);
+		ll r = Random::integer<ll>(-1'000'000'000, 1'000'000'000);
+		ll x = xs[Random::integer<int>(N)];
+		Fun f{m, c};
+
+		t.start();
+		tree.segmentInsert(f, l, r);
+		hash ^= tree.query(x);
+		t.stop();
+	}
+	if (t.time > 1000) cerr << "too slow: " << t.time << FAIL;
+	cerr << "tested performance: " << t.time << "ms (hash: " << hash << ")" << endl;
+}
+
+int main() {
+	stress_test(100);
+	stress_test(1'000);
+	stress_test(1'000'000);
+	performance_test();
+}