Compilare: main.cpp: In function 'int main()': main.cpp:24:38: warning: array subscript has type 'char' [-Wchar-subscripts] lng[a.sz-1] = cnt[a.back()[0]] + 1; ^ main.cpp:25:39: warning: array subscript has type 'char' [-Wchar-subscripts] prec[a.sz-1] = lst[a.back()[0]]; ^ main.cpp:26:46: warning: array subscript has type 'char' [-Wchar-subscripts] if (lng[a.sz-1] > cnt[a.back().back()]){ ^ main.cpp:27:32: warning: array subscript has type 'char' [-Wchar-subscripts] cnt[a.back().back()] = lng[a.sz-1]; ^ main.cpp:28:32: warning: array subscript has type 'char' [-Wchar-subscripts] lst[a.back().back()] = a.sz-1; ^ main.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.sz; i++) ^