Compilare: user.cpp: In function ‘void dell(line)’: user.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();i++) ~^~~~~~~~~ user.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;i+1<S.size();i++) S[i] = S[i+1]; ~~~^~~~~~~~~ user.cpp: In function ‘int UPline(int, int)’: user.cpp:60:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;p<S.size();p<<=1); ~^~~~~~~~~ user.cpp:62:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st+p<S.size() && abs(getY(S[st+p],x) - y)<=eps) return 1; ~~~~^~~~~~~~~ user.cpp:63:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (st+p<S.size() && getY(S[st+p],x) >= y) st+=p; ~~~~^~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<M[P[i].x].size();j++) ~^~~~~~~~~~~~~~~~~ user.cpp:89:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<E[i].size();j++) ~^~~~~~~~~~~~ user.cpp:93:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<M[i].size();j++) if (M[i][j]!=-1 && UPline(i,M[i][j])%2) nr++; ~^~~~~~~~~~~~