Compilare: main.cpp: In function 'int main()': main.cpp:20:18: 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 = 0; i < ord.size(); i++){ | ~~^~~~~~~~~~~~ main.cpp:26:18: warning: unused variable 'x' [-Wunused-variable] 26 | char x = (char)(i - 10 + 'A'); | ^ main.cpp:39:18: warning: unused variable 'x' [-Wunused-variable] 39 | char x = ch[sir[j] - 'a']; | ^