Compilare: user.cpp: In constructor ‘CYK_Algorithm::CYK_Algorithm()’: user.cpp:83:33: warning: unused variable ‘trash’ [-Wunused-variable] char nonTerminalSymbol, trash; ^ user.cpp: In member function ‘void CYK_Algorithm::makeTable(const string&)’: user.cpp:110:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < word.length(); ++i) ^ user.cpp:114:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int step = 1; step < word.length(); ++step) { ^ user.cpp:119:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < CYKtable[step].size(); ++i) { // i take every cell from this row ^ user.cpp: In member function ‘void CYK_Algorithm::printTable()’: user.cpp:156:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < word.length(); ++i) { ^ user.cpp:157:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < word.length() - i; ++j) ^