10 Toughest Google Interview Questions and Answers

1. Model Raindrops Falling on a Sidewalk (sidewalk is 1m and raindrops are 1cm). How Can We Know When the Sidewalk is Completely Wet?

Software Engineer

Here’s how you can model it in Python

import math

#Length and width of sidewalk in meters

sidewalk_length = 1.0

sidewalk_width = 1.0

#Diameter of a raindrop in meters

raindrop_diameter = 0.01

#Area of the sidewalk

sidewalk_area = sidewalk_length * sidewalk_width

#Area of a single raindrop

raindrop_radius = raindrop_diameter / 2

raindrop_area = math.pi * (raindrop_radius ** 2)

#Number of raindrops required to cover the entire surface of the sidewalk

num_raindrops = math.ceil(sidewalk_area / raindrop_area)

print(“The number of raindrops required to cover the entire surface of the sidewalk is:”, num_raindrops)

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