implementer.cpp:22:34: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   22 | inline void freadn(register int *Q) {
      |                                  ^
implementer.cpp:27:37: warning: ISO C++17 does not allow ‘register’ storage class specifier [-Wregister]
   27 | inline void freadstr(register char *s) {
      |                                     ^
implementer.cpp: In function ‘void readinp()’:
implementer.cpp:19:14: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   19 |         fread(ptr, 0x1, inSize, stdin);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccg9kAvZ.o: in function `main':
implementer.cpp:(.text.startup+0x403): undefined reference to `count_rectangles(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
collect2: error: ld returned 1 exit status