I applied online and was contacted by a recruiter. The process started with a behavioral phone interview going over the company and my background. The next step was an online HackerRank challenge for detecting insider trading. After the HackerRank challenge, I was invited to a technical phone interview using an online IDE to write my solution. After a few more phone calls with recruiters, I was invited to an onsite interview in NYC, which consisted of three 1-hour technical interviews and a tour of the office.

Technical Phone Interview: Using the language of your choice, determine if a given binary string is valid ASCII. I was given the following table to explain what valid ASCII means: every character must be in one of the following forms.

1-byte: 0???????
2-byte: 110????? 10?????? 3-byte: 1110???? 10?????? 10??????

Example: a: "01100001" aa: "0110000101100001" ü: "1100001110111100" ☃: "111000101001100010000011"

A sample input is; "111000101001100010000011"

You and a friend are at a Hack-A-Thon making a baking program where the user inputs ingredients and the program finds out what recipes you can make?

Given a binary tree, zig-zag print the nodes. 1 /
2 3 / \ /
7 6 5 4

Prints 1, 2, 3, 4, 5, 6, 7.