foo.cc: In function ‘bool operator<(Node, Node)’:
foo.cc:11:41: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   11 |         return x.num<y.num||x.num==y.num&&x.xh<y.xh;
      |                             ~~~~~~~~~~~~^~~~~~~~~~~
foo.cc: In function ‘int main()’:
foo.cc:21:23: error: too few arguments to function ‘ssize_t read(int, void*, size_t)’
   21 |                 m=read();x=read();
      |                   ~~~~^~
In file included from /nix/glibc-2.40-66-dev/include/bits/sigstksz.h:24,
                 from /nix/glibc-2.40-66-dev/include/signal.h:328,
                 from /nix/gcc-14.2.1.20250322/include/c++/14.2.1.20250322/csignal:42,
                 from stdc++.h:116:
/nix/glibc-2.40-66-dev/include/unistd.h:371:16: note: declared here
  371 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur
      |                ^~~~
foo.cc:21:32: error: too few arguments to function ‘ssize_t read(int, void*, size_t)’
   21 |                 m=read();x=read();
      |                            ~~~~^~
/nix/glibc-2.40-66-dev/include/unistd.h:371:16: note: declared here
  371 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur
      |                ^~~~