Compilare: main.cpp: In function 'int main()': main.cpp:37:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(j=0;j<bmin(s[i].size(),s[i-1].size())&&s[i][j]==s[i-1][j];j++){} | ^