Compilare: main.cpp: In function 'void add(char)': main.cpp:15:8: warning: array subscript has type 'char' [-Wchar-subscripts] 15 | fv[c]++; | ^ main.cpp:16:11: warning: array subscript has type 'char' [-Wchar-subscripts] 16 | if(fv[c]==1) | ^ main.cpp: In function 'void removee(char)': main.cpp:29:8: warning: array subscript has type 'char' [-Wchar-subscripts] 29 | fv[c]--; | ^ main.cpp:30:11: warning: array subscript has type 'char' [-Wchar-subscripts] 30 | if(fv[c]==0) | ^ main.cpp: In function 'int main()': main.cpp:36:9: warning: 'll' may be used uninitialized in this function [-Wmaybe-uninitialized] 36 | int ll,maxi=INT_MIN,i; | ^~