diff --git a/include/solution/1137.h b/include/solution/1137.h
new file mode 100644
index 0000000..7e4ac3c
--- /dev/null
+++ b/include/solution/1137.h
@@ -0,0 +1,14 @@
+// This file is generated by mkfile.py
+// Date: 2025-12-05
+
+#ifndef INC_1137_H
+#define INC_1137_H
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+    int tribonacci(int n);
+#ifdef __cplusplus
+}
+#endif
+#endif // INC_1137_H
diff --git a/src/1137.c b/src/1137.c
new file mode 100644
index 0000000..dbb1d09
--- /dev/null
+++ b/src/1137.c
@@ -0,0 +1,7 @@
+// This file is generated by mkfile.py
+// Date: 2025-12-05
+
+#include <solution/1137.h>
+int tribonacci(int n)
+{
+}
\ No newline at end of file
diff --git a/tests/test_1137.cpp b/tests/test_1137.cpp
new file mode 100644
index 0000000..1970140
--- /dev/null
+++ b/tests/test_1137.cpp
@@ -0,0 +1,41 @@
+// This file is generated by mkfile.py
+// Date: 2025-12-05
+
+#include <gtest/gtest.h>
+#include <solution/1137.h>
+
+// Tests for tribonacci (LeetCode 1137)
+class TribonacciTest : public ::testing::Test
+{
+  protected:
+    void AssertTribo(int n, int expected)
+    {
+        ASSERT_EQ(tribonacci(n), expected);
+    }
+};
+
+TEST_F(TribonacciTest, BaseCases)
+{
+    AssertTribo(0, 0);
+    AssertTribo(1, 1);
+    AssertTribo(2, 1);
+}
+
+TEST_F(TribonacciTest, SmallNumbers)
+{
+    AssertTribo(3, 2);
+    AssertTribo(4, 4);
+    AssertTribo(5, 7);
+}
+
+TEST_F(TribonacciTest, MediumNumbers)
+{
+    AssertTribo(10, 149);
+    AssertTribo(15, 3136);
+}
+
+TEST_F(TribonacciTest, UpperBound)
+{
+    AssertTribo(25, 1389537);
+    AssertTribo(37, 2082876103);
+}