Plz share some technical questions for amazon

technical questions

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Important technical questions:
·        
You’re given a Boolean 2D matrix, can you find the number of islands?
·         Given an array of strings, find if the given strings can be chained to form a circle. A string X can be put before another string Y in circle if the last character of X is same as first character of Y.
·         Tell us an efficient data structure for minimizing the following operations if we have an array arr[0 . . . n-1].
·         Add a value x to array from index l to r where 0 <= l <= r <= n-1
·         Find the value of a specified element of the array arr[i] where 0 <= i <= n-1
·         Is {a, n, d} a palindrome? If you are given a random string, is it a palindrome or not?
·         Questions on Implementation of AVL tree.
 

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