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Suppose you have 100 doors, and on crossing each door you toogle that door. intially all doors are open. then you cross each door on the first walk. on the second you toggle all the alternate doors. On the third you toggle every third door. When you have made your 100th walk, which doors will remain open and which will remain shut?
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Software Development Engineer In Test (SDET)

Interviewed at SOTI

3★
May 7, 2022

Suppose you have 100 doors, and on crossing each door you toogle that door. intially all doors are open. then you cross each door on the first walk. on the second you toggle all the alternate doors. On the third you toggle every third door. When you have made your 100th walk, which doors will remain open and which will remain shut?

You are given a n*n matrix of bits (1s and 0s) where 1 represents land and 0 represents water. Adjacent 1s can be considered as joined together to form sort of island in water. Count the number of islands. Discuss complexity.
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Software Development Engineer In Test I (SDET)

Interviewed at Amazon

3.5★
Sep 28, 2012

You are given a n*n matrix of bits (1s and 0s) where 1 represents land and 0 represents water. Adjacent 1s can be considered as joined together to form sort of island in water. Count the number of islands. Discuss complexity.

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