Compilare: main.cpp: In function 'int main()': main.cpp:63:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v_in.size();i++){ ~^~~~~~~~~~~~ main.cpp:65:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == v_in.size()-1){ ~~^~~~~~~~~~~~~~~~ main.cpp:82:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v_in.size();i++) ~^~~~~~~~~~~~