Compilare: main.cpp: In function 'int main()': main.cpp:20:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(i = 3; i < input.size(); i++) { | ~~^~~~~~~~~~~~~~ main.cpp:37:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | while(i < input.size()) { | ~~^~~~~~~~~~~~~~ main.cpp:13:17: warning: unused variable 'j' [-Wunused-variable] 13 | int cer, i, j, l = 0, lmax = 1, ans = 0, top; | ^