/in/foo.c: In function 'main':
/in/foo.c:8:10: warning: unknown conversion type character '|' in format [-Wformat=]
  scanf("%|d %|d",&L,&R);
          ^
/in/foo.c:8:14: warning: unknown conversion type character '|' in format [-Wformat=]
  scanf("%|d %|d",&L,&R);
              ^
/in/foo.c:8:8: warning: too many arguments for format [-Wformat-extra-args]
  scanf("%|d %|d",&L,&R);
        ^~~~~~~~~