Compilare: main.cpp: In function 'int main()': main.cpp:19:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for(i = 3; i < input.size(); i++) { | ~~^~~~~~~~~~~~~~ main.cpp:12:17: warning: unused variable 'j' [-Wunused-variable] 12 | int cer, i, j, l = 0, lmax = 1, ans = 0, top; | ^