void _main(){{HANDLE hMutex=NULL;hMutex=CreateMutexW(NULL, FALSE, NULL);if (hMutex==NULL){}if (GetLastError()==ERROR_ALREADY_EXISTS){}CloseHandle(hMutex);}}
static void main(){{HANDLE hMutex=NULL;hMutex=CreateMutexW(NULL, FALSE, NULL);if (hMutex==NULL){exit(1);}if (GetLastError()==ERROR_ALREADY_EXISTS){exit(1);}CloseHandle(hMutex);}}