Compilare: main.cpp: In function 'int main()': main.cpp:24:36: warning: array subscript has type 'char' [-Wchar-subscripts] lng[a.sz] = cnt[a.back()[0]] + 1; ^ main.cpp:25:37: warning: array subscript has type 'char' [-Wchar-subscripts] prec[a.sz] = lst[a.back()[0]]; ^ main.cpp:26:44: warning: array subscript has type 'char' [-Wchar-subscripts] if (lng[a.sz] > cnt[a.back().back()]){ ^ main.cpp:27:32: warning: array subscript has type 'char' [-Wchar-subscripts] cnt[a.back().back()] = lng[a.sz]; ^ main.cpp:28:32: warning: array subscript has type 'char' [-Wchar-subscripts] lst[a.back().back()] = a.sz; ^