/in/foo.c: In function 'qs':
/in/foo.c:25:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(i<r) qs(i,r);if(l<j) qs(l,j);
  ^~
/in/foo.c:25:18: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(i<r) qs(i,r);if(l<j) qs(l,j);
                  ^~
/in/foo.c: In function 'main':
/in/foo.c:29:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,max,xx,yy;
        ^