Compilare: main.cpp: In function 'int main()': main.cpp:51:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | for(int i=0; i<ss.size(); ++i) st_pos[ss[i]-'A']=i ; | ~^~~~~~~~~~ main.cpp:65:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for(int i=1; i<ss.size(); ++i) | ~^~~~~~~~~~ main.cpp:67:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(int j=0; j+i<ss.size(); ++j) | ~~~^~~~~~~~~~