Compilare: main.cpp: In function 'int subsir(std::string, std::string)': main.cpp:12:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 12 | for(int j=0;j<b.length();j++) | ~^~~~~~~~~~~ main.cpp:14:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | if(i<a.length()) return 0; | ~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:27:76: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 27 | if(S[i].length()>smax.length() || S[i].length()==smax.length() && S[i]<smax) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~