Compilare: main.cpp: In function 'void readInput()': main.cpp:15:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i].size() > lmax || (s[i].size() == lmax && s[i] < s_max)) { ~~~~~~~~~~~~^~~~~~ main.cpp:15:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (s[i].size() > lmax || (s[i].size() == lmax && s[i] < s_max)) { ~~~~~~~~~~~~^~~~~~~ main.cpp: In function 'bool verifica(std::__cxx11::string, std::__cxx11::string)': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); ++i) { ~~^~~~~~~~~~ main.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = pos + 1; j < a.size(); ++j) { ~~^~~~~~~~~~ main.cpp:38:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (gasite == b.size()) ~~~~~~~^~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < rez.size(); ++j) { ~~^~~~~~~~~~~~