Compilare: main.cpp: In function 'int main()': main.cpp:44:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for ( j = 0; j < s.size(); j++ ) { | ~~^~~~~~~~~~ main.cpp:45:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else] 45 | if ( s[j] != 'E' ) | ^