Compilare: main.cpp: In function 'int main()': main.cpp:17:18: warning: variable 'a' set but not used [-Wunused-but-set-variable] 17 | char a,b,c; | ^ main.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(int i=0;i<s.size()-1;i++) | ~^~~~~~~~~~~ main.cpp:41:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i=1;i<s.size()-1;i++) | ~^~~~~~~~~~~