Compilare: user.cpp: In function ‘void solve()’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (found.count() < T) { ^ user.cpp:65:65: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (v[special_pos[left]] == val && left < special_pos.size()) { ^ user.cpp:71:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (found.count() < T) { ^ user.cpp:74:29: warning: ‘right’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << special_pos[right] - special_pos[left]; ^