Compilare: user.cpp: In function ‘long long int remainder(BIG&, long long int)’: user.cpp:28:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp: In function ‘void add(BIG&, long long int)’: user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < A.size() || t; i++, t /= 10) ^ user.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == A.size()) ^