Compilare: main.cpp: In function 'int main()': main.cpp:28:24: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | if(cnt_apariti[ch] < 1) | ^~ main.cpp:29:25: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | cnt_apariti[ch]++; | ^~ main.cpp:31:29: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | else if(cnt_apariti[ch] < 2) | ^~ main.cpp:32:29: warning: array subscript has type 'char' [-Wchar-subscripts] 32 | cnt_apariti[ch]++, | ^~ main.cpp:36:25: warning: array subscript has type 'char' [-Wchar-subscripts] 36 | cnt_apariti[ch]++, | ^~