combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:39:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
39 | if ( y == s.length()) s += 'Y';
| ~~^~~~~~~~~~~~~
combo.cpp:40:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
40 | else if ( y == s.length() + 1) s += 'B';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:53:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
53 | if ( y == s.length()) s += 'Y';
| ~~^~~~~~~~~~~~~
combo.cpp:54:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
54 | else if ( y == s.length() + 1) s += 'A';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:67:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
67 | if ( y == s.length()) s += 'Y';
| ~~^~~~~~~~~~~~~
combo.cpp:68:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
68 | if ( y == s.length() + 1) s += 'A';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:69:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
69 | if ( y == s.length() + 2 ) s += 'B';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:81:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
81 | if ( y == s.length() ) s += 'A';
| ~~^~~~~~~~~~~~~
combo.cpp:82:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
82 | if ( y == s.length() + 1) s += 'B';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:83:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
83 | if ( y == s.length() + 2 ) s += 'X';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:92:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
92 | if ( y == s.length() + 1) s += 'B';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:98:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
98 | if ( y == s.length() + 1) s += 'X';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:107:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
107 | if ( y == s.length() + 1) s += 'A';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:113:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
113 | if ( y == s.length() + 1) s += 'X';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:122:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
122 | if ( y == s.length() + 1) s += 'A';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:128:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
128 | if ( y == s.length() + 1) s += 'B';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:137:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
137 | if ( y == s.length() + 1) s += 'A';
| ~~^~~~~~~~~~~~~~~~~
combo.cpp:143:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
143 | if ( y == s.length() + 1) s += 'B';
| ~~^~~~~~~~~~~~~~~~~