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Lỗi biên dịch:

Main.cc: In function ‘int calculateMaxValue(const string&)’:
Main.cc:7:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 1; i < str.length(); i++) {
                     ~~^~~~~~~~~~~~~~
Main.cc:10:26: error: assignment of read-only location ‘(& str)->std::__cxx11::basic_string::operator[](((std::__cxx11::basic_string::size_type)i))’
                 str[i] = 'b';
                          ^~~
Main.cc:12:26: error: assignment of read-only location ‘(& str)->std::__cxx11::basic_string::operator[](((std::__cxx11::basic_string::size_type)i))’
                 str[i] = 'a';
                          ^~~
Main.cc:14:26: error: assignment of read-only location ‘(& str)->std::__cxx11::basic_string::operator[](((std::__cxx11::basic_string::size_type)i))’
                 str[i] = 'a';
                          ^~~