/in/foo.cc: In function 'int main()':
/in/foo.cc:44:9: warning: unused variable 'temp' [-Wunused-variable]
     int temp = pow(10, N / 2 + 1 - i);
         ^~~~
/in/foo.cc:48:9: warning: unused variable 'temp' [-Wunused-variable]
     int temp = pow(10, N / 2 - i);
         ^~~~
/in/foo.cc:78:11: warning: 'tans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout << tans << endl;
           ^~~~