Compilare: user.cpp: In function ‘int main()’: user.cpp:28:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[it] ++; ^ user.cpp:29:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] indexes[it].insert(cnt); ^ user.cpp:32:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (fr[it] > text.size() / 2) ^ user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (fr[it] > text.size() / 2) ~~~~~~~^~~~~~~~~~~~~~~~~ user.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < text.size(); ++ i) ~~^~~~~~~~~~~~~