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puzzle : there is a island and the resident are either blue or black eyed. The residents are trapped in the island and want to leave. One day a foreigner comes and says there are few blue eyed people. He will be sending a steamer to the island every day and blue eyed people can leave. But if a black eyed person approaches the steamer, he will be killed. Constraint: No body knows their eye colour and can't even ask or say the colour to any other person. even cant see their reflection. So how many days is required for all the blue eyed person to leave the island.
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Senior Software Engineer

Interviewed at MakeMyTrip

4.1★
Aug 26, 2016

puzzle : there is a island and the resident are either blue or black eyed. The residents are trapped in the island and want to leave. One day a foreigner comes and says there are few blue eyed people. He will be sending a steamer to the island every day and blue eyed people can leave. But if a black eyed person approaches the steamer, he will be killed. Constraint: No body knows their eye colour and can't even ask or say the colour to any other person. even cant see their reflection. So how many days is required for all the blue eyed person to leave the island.

You have an array randomly filled with red, blue and green items. How do you order this list so the red items are at the beginning, followed by the blue ones, followed by the green ones? The algorithm should be in-place (no extra storage, or only constant extra storage) and the algorithm should only walk threw the array once (every position can only be read once).
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Programmer

Interviewed at IG Group

2.9★
Feb 27, 2010

You have an array randomly filled with red, blue and green items. How do you order this list so the red items are at the beginning, followed by the blue ones, followed by the green ones? The algorithm should be in-place (no extra storage, or only constant extra storage) and the algorithm should only walk threw the array once (every position can only be read once).

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