Time limit issues about judger

[virusdefender]

compiler optimization

g++ -O0

gdb-peda$ pdisass main
Dump of assembler code for function main:
   0x000000000000073a <+0>:	push   rbp
   0x000000000000073b <+1>:	mov    rbp,rsp
   0x000000000000073e <+4>:	mov    QWORD PTR [rbp-0x8],0x0
   0x0000000000000746 <+12>:	movabs rax,0x9184e729fff
   0x0000000000000750 <+22>:	cmp    QWORD PTR [rbp-0x8],rax
   0x0000000000000754 <+26>:	jg     0x75e <main+36>
   0x0000000000000756 <+28>:	nop
   0x0000000000000757 <+29>:	add    QWORD PTR [rbp-0x8],0x1
   0x000000000000075c <+34>:	jmp    0x746 <main+12>
   0x000000000000075e <+36>:	mov    eax,0x0
   0x0000000000000763 <+41>:	pop    rbp
   0x0000000000000764 <+42>:	ret
End of assembler dump.

g++ -O2

Dump of assembler code for function main:
   0x0000000000000630 <+0>:	xor    eax,eax
   0x0000000000000632 <+2>:	ret
End of assembler dump.