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Interview Questions for American Express

1. How would you sort an array without using built-in sorting functions?

2. Left View of a Binary Tree Problem Statement Given a binary tree, your task is to print the left view of the tree. Example: Input: The input will be in level order form, with node values separated by a space. Use -1 to denote null nodes. Output: The Left View of the tree. Explanation: Consider the following tree structure:Level 1: Root = 1Level 2: Left = 2, Right = 3Level 3: Left = 4 (of 2), Right = 5 (of 3), Right = 6 (of 3)Level 4: Right = 7 (of 4)The Left View of this tree is: 1 2 4 7 Constraints: 0 <= N <= 105 1 <= data <= 105 Time limit: 1 second

3. Write a program to print prime numbers from 1 to n.

4. What data would you collect from customers to improve the sales of your supermarket?

5. Write a program to find the 2nd highest number in an unsorted array.

American Express

American Express

|

Financial Services

New York

63,700 Employees

332 Jobs

    Key People

  • Stephen Squeri

    Chairman and Chief Executive Officer
  • Jeffrey C. Campbell

    Chief Financial Officer
cta

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