Compilare: user.cpp: In function ‘void Solve()’: user.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<D.size(); i++){ ^ user.cpp:46:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<D.size() && abs(D[j] - D[i]) < tol; j++) ^ user.cpp:32:15: warning: unused variable ‘el’ [-Wunused-variable] double m, el; ^