Error(s):

source_file.c: In function ‘main’:
source_file.c:14:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%d",&L,&S);
  ^
/tmp/ccAp5sv5.o: In function `main':
source.c:(.text.startup+0x177): undefined reference to `sqrt'
source.c:(.text.startup+0x18a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status