feat: new problem being formated.

ra-preguicosa/src/checker.cpp

@@ -0,0 +1,12 @@
+#include "testlib.h"
+#include <bits/stdc++.h>
+
+
+using namespace std;
+
+
+int main(int argc, char* argv[]) {
+    setName("Set the name of your checker here");
+    registerTestlibCmd(argc, argv);
+    return 0;
+}