# Interview brain teasers pdf

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Please forward this error screen to sharedip-1666227183. It’s just something I’ve never managed to successfully motivate myself to learn about despite knowing it’s going to come up in every single interview. What is the Big O of that? This is the wrong attitude and the wrong approach, and I have finally decided it is time to face my demons. All the resources I’ve found online I’ve sent me quickly to sleep, so I am determined to create an accessible Big O mastery page. What on earth is Big O? Big O is the way of measuring the efficiency of an algorithm and how well it scales based on the size of the dataset.

Imagine you have a list of 10 objects, and you want to sort them in order. There’s a whole bunch of algorithms you can use to make that happen, but not all algorithms are built equal. Some are quicker than others but more importantly the speed of an algorithm can vary depending on how many items it’s dealing with. The complexity will increase or decrease in accordance with the size of the data store. Download the PDF of The Idiots Guide To Big-O now for free! Below is a list of the Big O complexities in order of how well they scale relative to the dataset. This means irrelevant of the size of the data set the algorithm will always take a constant time.

1 item takes 1 second, 10 items takes 1 second, 100 items takes 1 second. It always takes the same amount of time. Logarithmic Complexity: Not as good as constant, but still pretty good. The time taken increases with the size of the data set, but not proportionately so.

This means the algorithm takes longer per item on smaller datasets relative to larger ones. 1 item takes 1 second, 10 items takes 2 seconds, 100 items takes 3 seconds. If your dataset has 10 items, each item causes 0. If your dataset has 100, it only takes 0.

Linear Complexity: The larger the data set, the time taken grows proportionately. 1 item takes 1 second, 10 items takes 10 seconds, 100 items takes 100 seconds. A nice combination of the previous two. 1 item takes 2 seconds, 10 items takes 12 seconds, 100 items takes 103 seconds. Quadratic Complexity: Things are getting extra slow. 1 item takes 1 second, 10 items takes 100, 100 items takes 10000.