Compilare: user.cpp: In function ‘int main()’: user.cpp:9:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=0;i<n;i++) fr[s[i]]++; ^ user.cpp:13:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[j]==(n-i)/2+2) c=j, w=0; ^ user.cpp:15:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[j] && j!=cv) c=j, w=0; ^ user.cpp:16:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] g<<c; fr[c]--; cv=c; ^ user.cpp:7:23: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] { int n,i,w; char j,c,cv=0,s[1000002]; ^