Compilare: user.cpp: In function ‘int main()’: user.cpp:34:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<_vNumbers.size(); i++) ^ user.cpp:36:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((i<_vNumbers.size())&&(_vNumbers[i]==_vNumbers[i+1])) ^ user.cpp:46:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (a=0; a<_vTickets.size(); a++) ^ user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (b=0; b<_vTickets.size(); b++) ^ user.cpp:52:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (c=0; c<_vTickets.size(); c++) ^ user.cpp:57:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (d=0; d<_vTickets.size(); d++) ^ user.cpp:62:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (e=0; e<_vTickets.size(); e++) ^ user.cpp:67:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (f=0; f<_vTickets.size(); f++) ^ user.cpp:44:21: warning: unused variable ‘s1’ [-Wunused-variable] int a,b,c,d,e,f,s1,s2,s3,s4,s5,s6; ^