Compilare: user.cpp: In function ‘void BF1()’: user.cpp:38:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[k].size(); i++) ^ user.cpp: In function ‘void BF2()’: user.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<b[k].size(); i++) ^ user.cpp: In function ‘void Salv()’: user.cpp:74:17: warning: variable ‘poz’ set but not used [-Wunused-but-set-variable] int i,maxim,poz; ^