diff --git a/13xxx/13312.cpp b/13xxx/13312.cpp
new file mode 100644
index 00000000..f34355df
--- /dev/null
+++ b/13xxx/13312.cpp
@@ -0,0 +1,22 @@
+#include <cstdlib>
+#include <iostream>
+using namespace std;
+
+void solve(void) {
+  const int n = 50000;
+  const int s = 1234;
+
+  cout << 2 * n << "\n";
+  srand(s);
+  for (int i=0; i<n; i++) cout << rand() % 1000000000 << "\n";
+  srand(s);
+  for (int i=0; i<n; i++) cout << -(rand() % 1000000000) << "\n";
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  solve();
+  return 0;
+}
\ No newline at end of file