Compilare: user.cpp: In function ‘int cautbin()’: user.cpp:34:9: warning: unused variable ‘i’ [-Wunused-variable] int i=0,k=0,pas=1<<20,m,e,pred; ^ user.cpp:34:27: warning: unused variable ‘m’ [-Wunused-variable] int i=0,k=0,pas=1<<20,m,e,pred; ^ user.cpp:34:29: warning: unused variable ‘e’ [-Wunused-variable] int i=0,k=0,pas=1<<20,m,e,pred; ^ user.cpp:34:31: warning: unused variable ‘pred’ [-Wunused-variable] int i=0,k=0,pas=1<<20,m,e,pred; ^~~~ user.cpp: In function ‘int main()’: user.cpp:54:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] fv[a[i]][i+1]++; ^