Compilare: main.cpp: In function 'bool deletecommon(std::__cxx11::string&, std::__cxx11::string&)': main.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < a.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:86:9: warning: unused variable 'rot' [-Wunused-variable] int rot = sum % n; ^~~