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Software 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

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); }

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 phone screen: Print all the nodes of a tree in reverse level order (ie print all the nodes at the leaves first, then print the nodes on the level above the leaves, and then eventually work your way to the top).

4 Answers

write a wrapper fun for 32-byte aligned mem allocation

2 Answers

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

What's wrong with this code?

1 Answer

Have you ever had a work place conflict and if so, how did you solve it?

1 Answer

When an application exception is thrown in a stateless session bean... will the transaction get rolled back?

1 Answer

Design the recommendations list for amazon webpage.

1 Answer

Oral exam by 3 people. One asked how I would troubleshoot a catastrophic failure. No specifics given.

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
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