811. 交换数值

https://www.acwing.com/problem/content/submission/code_detail/14063770/

AcWing/811/811.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int x, y;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> x >> y;
+    cout << y << ' ' << x << endl;
+
+    return 0;
+}