/in/foo.c: In function 'main':
/in/foo.c:8:14: warning: comparison of constant '24' with boolean expression is always true [-Wbool-compare]
  if(a[0]<a[1]<24&&b[0]<b[1]<60&&c[0]<c[1]<60)
              ^
/in/foo.c:8:9: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(a[0]<a[1]<24&&b[0]<b[1]<60&&c[0]<c[1]<60)
     ~~~~^~~~~
/in/foo.c:8:28: warning: comparison of constant '60' with boolean expression is always true [-Wbool-compare]
  if(a[0]<a[1]<24&&b[0]<b[1]<60&&c[0]<c[1]<60)
                            ^
/in/foo.c:8:23: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(a[0]<a[1]<24&&b[0]<b[1]<60&&c[0]<c[1]<60)
                   ~~~~^~~~~
/in/foo.c:8:42: warning: comparison of constant '60' with boolean expression is always true [-Wbool-compare]
  if(a[0]<a[1]<24&&b[0]<b[1]<60&&c[0]<c[1]<60)
                                          ^
/in/foo.c:8:37: warning: comparisons like 'X<=Y<=Z' do not have their mathematical meaning [-Wparentheses]
  if(a[0]<a[1]<24&&b[0]<b[1]<60&&c[0]<c[1]<60)
                                 ~~~~^~~~~