Help in problem ZOMCAV

zombie and the caves aug19B
can any one explain why would the radiation have to be decrease according to explanation in editorial but in the question the problem there is not mention

Where it is written decrease?

see last line of paragraph just above to above from the explanation

Refer this video for Array manipulation, Your doubt will get cleared surely.
Link :

thank for helping video is just good explanatory :blush::blush:

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