fix

Author: lrvideckis

tests/library_checker_aizu_tests/math/xor_basis_intersection.test.cpp

@@ -37,7 +37,8 @@ int main() {
     cin >> n;
     basis basis1;
     basis_ordered<int> basis2; // to check that it compiles
-    assert(empty(basis2.b)); // remove unused var warning
+    assert(
+      sz(basis2.b) == lg); // remove unused var warning
     basis_ordered<ll> basis3;
     basis_ordered<bitset<lg>> basis4;
     for (int i = 0; i < n; i++) {
@@ -56,6 +57,7 @@ int main() {
     cin >> m;
     basis basis5;
     basis_ordered<int> basis6;
+    assert(sz(basis6.b) == lg);
     basis_ordered<ll> basis7;
     basis_ordered<bitset<lg>> basis8;
     for (int j = 0; j < m; j++) {