Compilare: main.cpp: In function 'void solve(std::string&)': main.cpp:11:16: warning: array subscript has type 'char' [-Wchar-subscripts] 11 | if (ch[s[i]]==1){ | ^ main.cpp:13:23: warning: array subscript has type 'char' [-Wchar-subscripts] 13 | while (ch[s[i]]==1){ | ^ main.cpp:22:21: warning: array subscript has type 'char' [-Wchar-subscripts] 22 | else if (ch[s[i]]==2){ | ^ main.cpp:23:23: warning: array subscript has type 'char' [-Wchar-subscripts] 23 | while (ch[s[i]]==2){ | ^ main.cpp: In function 'int main()': main.cpp:71:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | while (i<s.size()){ | ~^~~~~~~~~