Placement Papers - Amazon

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Amazon interview questions

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INTERVIEW : Amazon interview questions
               
Given       a Binary Search Tree, write a program to print the kth smallest element       without using any static/global variable. You can?t pass the value k to       any function also.
                 
What       are the 4 basics of OOP?
                 
Define       Data Abstraction. What is its importance?
                 
Given       an array of size n. It contains numbers in the range 1 to n. Each number       is present at least once except for 2 numbers. Find the missing numbers.
                 
Given       an array of size n. It contains numbers in the range 1 to n. Find the       numbers which aren?t present.
                 
Given       a string,find the first un-repeated character in it? Give some test cases
                 
You       are given a dictionary of all valid words. You have the following 3       operations permitted on a word: delete a character, insert a character,       replace a character. Now given two words - word1 and word2 - find the       minimum number of steps required to convert word1 to word2. (one operation       counts as 1 step.)
                 
Given       a cube of size n*n*n (i.e made up of n^3 smaller cubes), find the number       of smaller cubes on the surface. Extend this to k-dimension.
                 
What       is a C array and illustrate the how is it different from a list.
                 
What       is the time and space complexities of merge sort and when is it preferred       over quick sort?
                 
Write       a function which takes as parameters one regular expression(only ? and *       are the special characters) and a string and returns whether the string       matched the regular expression.
                 
Given       n red balls and m blue balls and some containers, how would you distribute       those balls among the containers such that the probability of picking a       red ball is maximized, assuming that the user randomly chooses a container       and then randomly picks a ball from that.
                 
Find       the second largest element in an array with minimum no of comparisons and       give the minimum no of comparisons needed on an array of size N to do the       same.
                 
Given       an array of size n, containing every element from 1 to n+1, except one.       Find the missing element.
                 
How       do you convert a decimal number to its hexa-decimal equivalent.Give a C       code to do the same
                 
Explain       polymorphism. Provide an example.
                 
Given       an array all of whose elements are positive numbers, find the maximum sum       of a subsequence with the constraint that no 2 numbers in the sequence       should be adjacent in the array. So 3 2 7 10 should return 13 (sum of 3       and 10) or 3 2 5 10 7 should return 15 (sum of 3, 5 and 7)
                 
You       are given some denominations of coins in an array (int denom[])and       infinite supply of all of them. Given an amount (int amount), find the       minimum number of coins required to get the exact amount. What is the       method called?
                 
Given       an array of size n. It contains numbers in the range 1 to n. Each number       is present at least once except for 1 number. Find the missing number.  

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