/in/foo.cc: In function 'int main()':
/in/foo.cc:25:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   25 |     gets(x);
      |     ~~~~^~~
In file included from /in/foo.cc:1:
/usr/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
/in/foo.cc:32:31: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
   32 |     cmp[n] = '\0'; cmp[n - 1] = '1';    //初始化比较字符串cmp
      |                    ~~~~~~~~~~~^~~~~
/in/foo.cc:27:10: note: at offset -1 into destination object 'cmp' of size 101
   27 |     char cmp[101] = {0};
      |          ^~~
/usr/bin/ld: /tmp/ccVhdk8L.o: in function `main':
foo.cc:(.text.startup+0x3c): warning: the `gets' function is dangerous and should not be used.