1 files changed, 30 insertions, 0 deletions
diff --git a/datastructures/test/segmentTree.cpp b/datastructures/test/segmentTree.cpp
new file mode 100644
index 0000000..79c16e6
--- /dev/null
+++ b/datastructures/test/segmentTree.cpp
@@ -0,0 +1,30 @@
+#include "segmentTree.tmp.cpp"
+
+void test(int n) {
+	vector<ll> a(n);
+	for (ll &x: a) x = util::randint();
+	SegTree seg(a);
+	for (int i = 0; i < 5*n; i++) {
+		{
+			int j = util::randint(n);
+			ll v = util::randint();
+			a[j] = v;
+			seg.update(j, v);
+		}
+		{
+			int l = util::randint(n+1);
+			int r = util::randint(n+1);
+			if (l > r) swap(l, r);
+			assert(
+				seg.query(l, r)
+				==
+				accumulate(a.begin() + l, a.begin() + r, 0ll)
+			);
+		}
+	}
+}
+
+int main() {
+	test(1000);
+	test(1);
+}