diff --git a/Luogu/P4549/P4549.cpp b/Luogu/P4549/P4549.cpp
new file mode 100644
index 00000000..563fa05a
--- /dev/null
+++ b/Luogu/P4549/P4549.cpp
@@ -0,0 +1,26 @@
+#include <iostream>
+#include <cmath>
+#include <experimental/numeric>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int n, ans;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    for (int i = 1, x; i <= n; i++) {
+        cin >> x;
+
+        ans = std::experimental::gcd(ans, std::abs(x));
+    }
+
+    cout << ans << endl;
+
+    return 0;
+}