/in/foo.c: In function 'main':
/in/foo.c:5:24: warning: unused variable 'j' [-Wunused-variable]
  int i, max1, max2, n, j;
                        ^
/in/foo.c:5:15: warning: unused variable 'max2' [-Wunused-variable]
  int i, max1, max2, n, j;
               ^~~~
/in/foo.c:5:9: warning: unused variable 'max1' [-Wunused-variable]
  int i, max1, max2, n, j;
         ^~~~