All questions are available in five languages. C implementation directory , C++ implementation directory , Python implementation directory , Java implementation directory , JavaScript implementation directory
topic
In 2XXX, humans conducted an analysis of the livable modification of the atmosphere of Mars, making Mars theoretically suitable for human habitation. Due to technical reasons, the entire atmosphere of Mars cannot be modified at one time, and can only be partially processed. It is assumed that The area to be transformed on Mars is a row * column grid. Each grid has 3 values, habitable zone, transformable zone, and dead zone. Use YES, NO, and NA instead. YES indicates that the grid has completed atmospheric transformation. NO means that the grid has not been transformed and can be transformed later. NA means the dead zone, which is not used to judge whether the transformation is completed or not. None