diff --git a/bjtu/1981/1981.cpp b/bjtu/1981/1981.cpp
new file mode 100644
index 00000000..2e0d51e7
--- /dev/null
+++ b/bjtu/1981/1981.cpp
@@ -0,0 +1,30 @@
+#include <iostream>
+#include <algorithm>
+#include <utility>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int n;
+
+    cin >> n;
+
+    while (n--) {
+        std::pair<int, int> p[2];
+
+        for (int i = 0; i < 2; i++) {
+            cin >> p[i].first >> p[i].second;
+        }
+
+        std::sort(p, p + 2);
+
+        cout << (p[1].first < p[0].second ? "YES" : "NO") << endl;
+    }
+
+    return 0;
+}