Compilare: main.cpp: In function 'int main()': main.cpp:92:26: warning: array subscript has type 'char' [-Wchar-subscripts] 92 | fr[a[i][j]]++; | ~~~~~~^ main.cpp:93:29: warning: array subscript has type 'char' [-Wchar-subscripts] 93 | if(fr[a[i][j]]>maxx) | ~~~~~~^ main.cpp:95:35: warning: array subscript has type 'char' [-Wchar-subscripts] 95 | maxx=fr[a[i][j]]; | ~~~~~~^