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Implement a simple version of Brex’s backend (check if card has enough remaining balance to accept incoming transaction) using database. After that, think about fraud detection, if all you have is the information about the transaction.
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Software Engineer, Backend

Interviewed at Brex

3.9★
Dec 21, 2018

Implement a simple version of Brex’s backend (check if card has enough remaining balance to accept incoming transaction) using database. After that, think about fraud detection, if all you have is the information about the transaction.

Determine whether a circular array with magic indexes contains a full circle. The array is circular in the sense that, the entry A[i] points to entry A[A[i]]. Full circle means it covers all the elements of the array. As a follow-up, I was asked to solve the problem in O(1) space. Example: Input: [2,3,1,4,0], Output: true Input: [2,3,2,4,9], Output: false
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Software Engineer, Backend

Interviewed at Zalando

3.6★
Jan 9, 2019

Determine whether a circular array with magic indexes contains a full circle. The array is circular in the sense that, the entry A[i] points to entry A[A[i]]. Full circle means it covers all the elements of the array. As a follow-up, I was asked to solve the problem in O(1) space. Example: Input: [2,3,1,4,0], Output: true Input: [2,3,2,4,9], Output: false

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