Compilare: user.cpp: In function ‘bool check(int, int)’: user.cpp:15:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<r.size();i++) if(r[i].first+dx!=b[i].first || r[i].second+dy!=b[i].second) return 0; ^ user.cpp: In function ‘void degree(int)’: user.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:31:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,x,y,c,d,e; ^