Compilare: main.cpp: In function 'void back(int)': main.cpp:34:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (index == litere.size()) ~~~~~~^~~~~~~~~~~~~~~~ main.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < litere.size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:79:36: warning: array subscript has type 'char' [-Wchar-subscripts] literaSemnificativa[termen[0]] = true; ^ main.cpp:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < termen.size(); j++) ~~^~~~~~~~~~~~~~~