Compilare: main.cpp: In function 'void roll(std::string, std::string, long long int)': main.cpp:26:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(i=0;i<ex1.length();i++){ | ~^~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:50:9: warning: unused variable 'm' [-Wunused-variable] 50 | int m,a,n,i,siz; | ^ main.cpp:50:11: warning: unused variable 'a' [-Wunused-variable] 50 | int m,a,n,i,siz; | ^ main.cpp:50:13: warning: unused variable 'n' [-Wunused-variable] 50 | int m,a,n,i,siz; | ^ main.cpp:50:15: warning: unused variable 'i' [-Wunused-variable] 50 | int m,a,n,i,siz; | ^