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.
The meaning of NCNS abbreviation is No Complications, No Sequelae What is NCNS abbreviation? One of the definitions of NCNS is No Complications, No Sequelae definition, categories, type and other relevant information provided by All Acronyms. NCNS stands for  Search for acronyms, abbreviations,