combo.cpp: In function 'std::string guess_sequence(long long int)':
combo.cpp:51:45: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
51 | if (press (v + buton[0] + v + buton[1]) > v.size()){
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
combo.cpp:52:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
52 | if (press (v + buton[0]) > v.size()){
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
/usr/bin/ld: /tmp/cc5urMUx.o: in function `main':
grader.cpp:(.text.startup+0x4c): undefined reference to `guess_sequence[abi:cxx11](int)'
collect2: error: ld returned 1 exit status