After a fairly simple technical phone screen, I was invited to Mountain View for the full day of interviews.

Consecutively, five interviewers led me through very in-depth technical questions that built from initial simplicity to elegant, algorithmic solutions. Each interview quickly tailored to my skill level, such that I had to talk my way through multiple possible solutions to complete the challenge.

One question dealt with detecting the 'edges' of a binary image by analyzing neighboring pixels in a two-dimensional grid.