foo.cpp: In function 'int main()':
foo.cpp:34:32: error: 'round' was not declared in this scope
   printf("%d ",int(round(ans[i])));printf("%d\n",int(round(ans[n])));
                                ^
foo.cpp:34:66: error: 'round' was not declared in this scope
   printf("%d ",int(round(ans[i])));printf("%d\n",int(round(ans[n])));
                                                                  ^