Learning about different problem solving strategies and when to use them will give you a good start. Problem solving is a process. Most strategies provide steps that help you identify the problem and choose the best solution. There are two basic types of strategies: algorithmic and heuristic.
It should be 'No vacancies' (plural). Vacant means empty/free. Vacancy is the state of being empty, therefore 'no vacancies' = no empty rooms.
Share This Story. Vacancy is one of those things that generally does not receive a lot of consideration until something happens. With the mortgage crisis, one hears about many vacant houses. There are also vacant lots that communities take over to grow gardens or establish as playgrounds for the local residents.