/in/foo.cc: In function 'long long int front()':
/in/foo.cc:49:8: warning: unused variable 'temp' [-Wunused-variable]
     ll temp = 0 ;
        ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:124:23: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'long long int' [-Wformat=]
     printf("%ld\n",tot) ;
                       ^