Compilare: main.cpp: In function 'int main()': main.cpp:14:12: warning: array subscript has type 'char' [-Wchar-subscripts] 14 | fr[ch]++; | ^~ main.cpp:21:19: warning: array subscript has type 'char' [-Wchar-subscripts] 21 | if(fr[j]>(n-i+1)/2) | ^ main.cpp:25:19: warning: array subscript has type 'char' [-Wchar-subscripts] 25 | fr[j]--; | ^ main.cpp:32:23: warning: array subscript has type 'char' [-Wchar-subscripts] 32 | if(fr[j]>0 && v[i-1]!=j) | ^ main.cpp:35:24: warning: array subscript has type 'char' [-Wchar-subscripts] 35 | fr[j]--; | ^