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No, all you see are cracks caused by shrinkage of the wall skin, and they have nothing to do with the roof slab.
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It may be caused by the natural settlement of the stairs, and it doesn't matter.
Is it irregular? If it is more regular, small cracks along the joints of the floor slab are normal and there is no danger, if there are horizontal and vertical slopes, it is better to find an insider.
My family lives on the 5th floor (top floor), and it is okay to break the beam from the living room to the balcony, and it is not okay to destroy the overall structure of the house.
It should be, it may be that the waterproofing of your bathroom is not done well, and it has leaked for a long time.
You know, the main valve is not absolutely easy to use. Many main valves have water leaks or slight water leaks. If you don't understand, do a pressure test to see if there is a leak in your water pipes.
If you come to the house by yourself, the water pipe leakage is the source, you have to be responsible for replacing it, and the common part should find the property or housing management unit. Knocking bricks at the water leakage does not affect the ability to knock, but it should be checked first whether the faucet interface or the sand hole in the middle of the pipe is leaking, and the sand hole should be replaced with a large amount of construction. It is convenient to change the direct change of the pipe to save trouble, and we must first confirm the leakage point to avoid large construction and small unitary.