Compilare: user.cpp: In function ‘void fact(int)’: user.cpp:25:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(o>1 && i<v.size()){ ^ user.cpp: In function ‘void defact(int)’: user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(o>1 && i<v.size()){ ^ user.cpp: In function ‘long long int comb(int, int)’: user.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ^ user.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ^