Compilare: user.cpp: In function ‘int main()’: user.cpp:81:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<_vTickets.size(); i++) ^ user.cpp:82:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<_vTickets.size(); j++) ^ user.cpp:88:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (q=0; q<_vTickets.size(); q++) ^ user.cpp:105:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<_vTickets.size(); i++) ^ user.cpp:106:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<_vTickets.size(); j++) ^ user.cpp:107:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (q=0; q<_vTickets.size(); q++) ^ user.cpp:80:22: warning: unused variable ‘iS3’ [-Wunused-variable] int i,j,q,iS,iS2,iS3; ^