/in/foo.cc: In function 'int main()':
/in/foo.cc:16:13: error: 'finalSurvivor' was not declared in this scope
     cout << finalSurvivor << endl;
             ^~~~~~~~~~~~~
/in/foo.cc:15:9: warning: unused variable 'fin' [-Wunused-variable]
     int fin = Remaining(n, k);
         ^~~