foo.cc: In function 'int main()':
foo.cc:17:21: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
   17 |                 gets(c);
      |                 ~~~~^~~
In file included from /nix/store/42izybv2fz3ps5pcg3dvcmn85pc9406y-gcc-11.3.0/include/c++/11.3.0/cstdio:42,
                 from stdc++.h:46:
/nix/store/ck17nf5q2m51d9jpkpsirx91s64vh202-glibc-2.35-163-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.cc:43:18: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   43 |         printf("%d\n",ans);
      |                 ~^    ~~~
      |                  |    |
      |                  int  long long int
      |                 %lld
/nix/store/dpxy5cr7cm0nch0qvq2qygs9jwnmhiy5-binutils-2.38/bin/ld: /tmp/ccprfYSE.o: in function `main':
foo.cc:(.text.startup+0x61): warning: the `gets' function is dangerous and should not be used.

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