我的代码里原本没有任何问题，可以正常编译，但是新声明了一个bool类型的超过内存限制的数组：

bool vis[256][256][256][256][65536];

之后，洛谷的编译器就报错：

No valid executable file was produced by the compiler
/tmp/compiler_5e9egz_x/src: 在函数‘bool judge(char*)’中:
/tmp/compiler_5e9egz_x/src:20:23: 警告：comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
   20 |     for (int i = 0; i < strlen(ad); i++)
      |                     ~~^~~~~~~~~~~~
/tmp/compiler_5e9egz_x/src:30:49: 警告：comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
   30 |         if ((ad[i] == '.' || ad[i] == ':') && i == strlen(ad) - 1)
      |                                               ~~^~~~~~~~~~~~~~~~~
./ccSc434s.o: in function `_GLOBAL__sub_I_src':
src:(.text.startup+0x3c4): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: 错误：ld 返回 1

说是上面i和strlen()的比较出现了问题。

所以为什么上面加了数组之后下面的整型变量比较会出现问题？（纯属好奇）