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Software Development Engineer III Interview Questions


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Telephone interview: Find largest integer from an array of integers. The integers in the array are arranged in strictly increasing (no 2 integers are same) or strictly increasing then decreasing; so like a curve and you have to find the peak. Discuss time complexity. Write code.

3 Answers

Binary search

The question is a variation of the commonly asked problem of finding the start/end index of a sorted array that has been rotated. Takes O(log n) time.

First, binary search will not work since just looking at a single point will not tell you if it's on the decreasing or increasing side of the curve. What you need is modified binary search. Looking at position i check position i+1 if it's increasing then search right otherwise search left; Code: int peak(vector V, int i, int iStart, int iEnd){ assert( i >= 0 && i = 0 && iStart = 0 && iEnd < V.size()); assert( iStart <= i && i <= iEnd ); if (i == iEnd) return i; int iCurr = V[i]; int iNext = V[i+1]; int iStartNew = iStart; int iEndNew = iEndl if( iCurr < iNext ) iStartNew = i; else iEndNew = i; int iNew = (iEndNew-iStartNew)/2; if( iNew == i ) iNew++; return peak(V, iNew, iStartNew, iEndNew); }

Suppose you have a C++ base class and several classes that inherit from it. What might happen if you do not write a virtual destructor for the base class?

2 Answers

Find the last unique character in a character string

1 Answer

In Person with 4 people (~45min each): 1. Check if binary tree A is contained in binary tree B. Write code on paper. 2. Derive a formula for calculating the angle between the hour hand and minute hand in a clock. 3. Design a parking lot. Discuss what data structures to use.

1 Answer

Design the recommendations list for amazon webpage.

1 Answer

How to sync user shopping cart over multiple data centers.

1 Answer

Write a program to generate a "Unique Ticket" for each request. The number of requests could be quite large - up to a million per second.

I was asked to elaborate about an example of my technical creativity: present the problem to the interviewer and delineate the solution in quite a detailed way.

1 Answer

Write a function to calculate build order given a project with a list of dependencies that also need to be built

2 Answers
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