Compilare: user.cpp: In function ‘int main()’: user.cpp:39:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=ve.size()-3&&ve.size()<=k;i++) ^ user.cpp:39:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=ve.size()-3&&ve.size()<=k;i++) ^ user.cpp:16:15: warning: unused variable ‘b’ [-Wunused-variable] int v,n,a,b,c,i,minim=INT_MAX,nr=0; ^ user.cpp:16:17: warning: unused variable ‘c’ [-Wunused-variable] int v,n,a,b,c,i,minim=INT_MAX,nr=0; ^