Compilare: user.cpp: In function ‘int main()’: user.cpp:69:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(b=1;b<=26;++b) C[a][(a+1)*BASE+b]=C[a][(b+1)*BASE+a]=INF; ^ user.cpp:69:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(b=1;b<=26;++b) C[a][(a+1)*BASE+b]=C[a][(b+1)*BASE+a]=INF; ^ user.cpp:53:15: warning: unused variable ‘source’ [-Wunused-variable] int n,m,i,source=0,x,fmin,nr; ^ user.cpp:53:31: warning: unused variable ‘nr’ [-Wunused-variable] int n,m,i,source=0,x,fmin,nr; ^