It took around two weeks to receive the initial interview request.

The first round was a phone interview, and the second was a Google Hangouts interview. Both interviews included two back-to-back, one-hour coding sections that were conducted using Google Docs.

The interviewers for the first three sections were quite nice and helpful. However, the interviewer for the last section provided only a very abstract oral description of the question and became impatient when I attempted to clarify it.

Given two strings with the same length L, determine whether it's possible to form a palindrome of length L with one's head and another's tail.

Given a mine-sweeper game map and a position on the map, return the map status after flipping the grid at that position (this should reveal all adjacent grids if flipping on a safe one).

Implement the Bulls and Cows game.

Given a 1-D grid/array with several portals on it. A token is placed on the leftmost grid initially and moves one step right for each step. The token will be sent back for some steps if it steps on a portal. A portal will be closed forever once it's activated.

Return where the token stops for each step.

Given an unsorted numeric array of any length and k, return the k-th percentile of that series.