combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:12:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
12 | for(int j=0;j<y.size()-1;j++){
| ~^~~~~~~~~~~
/usr/bin/ld: /tmp/ccdLmrMV.o: in function `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x0): multiple definition of `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/ccPdLXmU.o:combo.cpp:(.text+0xc0): first defined here
/usr/bin/ld: /tmp/ccdLmrMV.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccPdLXmU.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status