Compilare: user.cpp: In function ‘void build_dp(std::__cxx11::string, std::__cxx11::string)’: user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= s.size(); ++i){ ~~^~~~~~~~~~~ user.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= s.size(); ++i){ ~~^~~~~~~~~~~ user.cpp:15:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= b.size(); ++j){ ~~^~~~~~~~~~~