Compilare: user.cpp: In function ‘void bfs()’: user.cpp:15:31: warning: right operand of comma operator has no effect [-Wunused-value] for(b=q[start++],i=0,a;i<adi[b].size();i++) ^ user.cpp:15:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(b=q[start++],i=0,a;i<adi[b].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:57:9: warning: variable ‘s’ set but not used [-Wunused-but-set-variable] int s,m,a,b,c,i,s1,s2; ^ user.cpp:57:17: warning: unused variable ‘c’ [-Wunused-variable] int s,m,a,b,c,i,s1,s2; ^