Compilare: main.cpp: In function 'int main()': main.cpp:18:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(fr[a[i][1]]==0) { ^ main.cpp:20:33: warning: array subscript has type 'char' [-Wchar-subscripts] } else l[i]=l[fr[a[i][1]]]+1,p[i]=fr[a[i][1]]; ^ main.cpp:20:53: warning: array subscript has type 'char' [-Wchar-subscripts] } else l[i]=l[fr[a[i][1]]]+1,p[i]=fr[a[i][1]]; ^ main.cpp:21:22: warning: array subscript has type 'char' [-Wchar-subscripts] if(fr[a[i][0]]==0) fr[a[i][0]]=i; ^ main.cpp:21:38: warning: array subscript has type 'char' [-Wchar-subscripts] if(fr[a[i][0]]==0) fr[a[i][0]]=i; ^ main.cpp:22:43: warning: array subscript has type 'char' [-Wchar-subscripts] else if(l[fr[a[i][0]]]<l[i]) fr[a[i][0]]=i; ^ main.cpp:22:62: warning: array subscript has type 'char' [-Wchar-subscripts] else if(l[fr[a[i][0]]]<l[i]) fr[a[i][0]]=i; ^ main.cpp:23:62: warning: array subscript has type 'char' [-Wchar-subscripts] else fr[a[i][0]]=p[i]; ^