foo.c: In function 'main':
foo.c:21:9: warning: implicit declaration of function 'get'; did you mean 'gets'? [-Wimplicit-function-declaration]
   21 |         get(s1);
      |         ^~~
      |         gets
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: /tmp/cccfOx1m.o: in function `main':
foo.c:(.text.startup+0xd): undefined reference to `get'
/nix/store/74y3751gsixaz9797ib0hp7c658sp1y5-binutils-2.40/bin/ld: foo.c:(.text.startup+0x1c): undefined reference to `get'
collect2: error: ld returned 1 exit status

[Hydro](https://hydro.ac)提供评测服务