Compilare: user.cpp: In function ‘bool eq(char, std::__cxx11::string)’: user.cpp:9:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~ user.cpp: In function ‘void parcurs(std::deque<char>&, int, std::__cxx11::string&, std::__cxx11::string&, std::deque<char>&, int, std::__cxx11::string&, std::deque<char>&, int, bool)’: user.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < source.size(); ++i) { ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~ user.cpp:86:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~ user.cpp:91:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); ++i) { ~~^~~~~~~~~~