Compilare: user.cpp: In function ‘long double solve(int, int)’: user.cpp:41:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a<L.size() && b<R.size()){ ^ user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a<L.size() && b<R.size()){ ^ user.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (b+1<R.size()) mn = min(mn,dist(L[a],R[b])); ^ user.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a+1<L.size()) mn = min(mn,dist(L[a],R[b])); ^