# Amazon Interview Experience | Set 425

Round 1: Technical Face 2 Face.

1. Write a program to find the range of majority elements in array(non-descending)?
2. Write program to print all the permutation of String? Example Input : AB, Output : {\$, “A”, “B”, “AB”};
3. Write program to transform a tree from give tree, such that each node will have the sum of child nodes plus itself.(Write recursive function)

To best of me i have given answer to all the three programs(little doubtful with 2nd one).

No Selected. 🙁

For first question my approach was:

 `public` `class` `MajorityRange { ` ` `  `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` `        ``int` `number[] = { ``1``, ``3``, ``3``, ``3``, ``3``, ``3``, ``4` `}; ` `        ``int` `size = number.length; ` `        ``int` `start = ``0``; ` `        ``int` `end = size - ``1``; ` `        ``int` `count = ``1``; ` `        ``for` `(``int` `i = ``1``; i < size; i++) { ` `            ``if` `(number[i] != number[i - ``1``]) { ` `                ``if` `(count > size / ``2``) { ` `                    ``end = i - ``1``; ` `                ``} ` `                ``else` `{ ` `                    ``start = i; ` `                ``} ` `            ``} ` `            ``else` `{ ` `                ``count++; ` `            ``} ` `        ``} ` `        ``System.out.println(``"Start = "` `+ start + ``"End = "` `+ end); ` `    ``} ` `} `

Explanation: Solved in O(n) time complexity. In order to improve the complexity we can use divide and conquer strategy(Modified version of Jump Search or interpolation Search)

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