Compilare: main.cpp: In function 'int main()': main.cpp:27:20: warning: array subscript has type 'char' [-Wchar-subscripts] fr[s[i]]++; ^ main.cpp:46:24: warning: array subscript has type 'char' [-Wchar-subscripts] if(fr[j]==2) ^ main.cpp:48:29: warning: array subscript has type 'char' [-Wchar-subscripts] else if(fr[j]>2) ^ main.cpp:49:30: warning: array subscript has type 'char' [-Wchar-subscripts] k=k-(fr[j]*(fr[j]+1)/2); ^ main.cpp:49:37: warning: array subscript has type 'char' [-Wchar-subscripts] k=k-(fr[j]*(fr[j]+1)/2); ^ main.cpp:53:20: warning: array subscript has type 'char' [-Wchar-subscripts] fr[s[i]]--; ^