Compilare: main.cpp: In function 'std::__cxx11::string transformaSiAduna(std::__cxx11::string, std::__cxx11::string, int, int)': main.cpp:12:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < a.size()) { ~~^~~~~~~~~~ main.cpp:16:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < b.size()) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); ++i) { ~~^~~~~~~~~~ main.cpp:70:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < v.size() - 1) ~~^~~~~~~~~~~~~~