Compilare: user.cpp: In function ‘void KMPprep(std::__cxx11::string&)’: user.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1 ; i < c.size() ; i++) { ~~^~~~~~~~~~ user.cpp: In function ‘void CoverWord(std::__cxx11::string&, std::__cxx11::string&)’: user.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < s.size() ; i++) { ~~^~~~~~~~~~ user.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j >= c.size()) { ~~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:66:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < s.size() ; i++) { ~~^~~~~~~~~~ user.cpp:88:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < s.size() ; i++) { ~~^~~~~~~~~~