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You are given 1000 containers of water with exactly one container containing poison. You can use pigs to test which container contains poison. The conditions are that: A pig drinking the poisoned water woudl die exactly after 1 hour and that a pig could be used for sampling multiple containers. Assume that the pig takes 0 time to drink water from any number of containers. What is the minimum number of pigs would you use to identify the poisoned container within 1 hour.
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Software Development Engineer

Interviewed at Amazon

3.5★
Mar 16, 2011

You are given 1000 containers of water with exactly one container containing poison. You can use pigs to test which container contains poison. The conditions are that: A pig drinking the poisoned water woudl die exactly after 1 hour and that a pig could be used for sampling multiple containers. Assume that the pig takes 0 time to drink water from any number of containers. What is the minimum number of pigs would you use to identify the poisoned container within 1 hour.

Given a binary tree with only upwards (parent) node references, re-construct the tree adding in child references. You are given a list of leaf nodes (sorted in left to right order). Tricks include making sure to account for extremely unbalanced trees.
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Software Engineer

Interviewed at Amazon

3.5★
Apr 27, 2011

Given a binary tree with only upwards (parent) node references, re-construct the tree adding in child references. You are given a list of leaf nodes (sorted in left to right order). Tricks include making sure to account for extremely unbalanced trees.

1. Given the sample: id, status 1, active 2, active 3, active 4, pending 5, expired 6, expired 7, expired 8, pending Pull the unique statuses that show up consecutively 3 times, e.g. from the sample, the output would be 'active', 'expired'. 2. Given the sample: employee, in_out, time A, IN, 6:00 B, IN, 7:00 A, OUT, 8:00 C, IN, 9:30 A, IN, 9:00 A, OUT, 10:00 B, OUT, 11:00 C, OUT, 10:00 Determine which employees are in the building at 10:30.
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Senior Data Engineer

Interviewed at Amazon

3.5★
Jan 7, 2022

1. Given the sample: id, status 1, active 2, active 3, active 4, pending 5, expired 6, expired 7, expired 8, pending Pull the unique statuses that show up consecutively 3 times, e.g. from the sample, the output would be 'active', 'expired'. 2. Given the sample: employee, in_out, time A, IN, 6:00 B, IN, 7:00 A, OUT, 8:00 C, IN, 9:30 A, IN, 9:00 A, OUT, 10:00 B, OUT, 11:00 C, OUT, 10:00 Determine which employees are in the building at 10:30.

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