Switching Between Pencils

When coloring a striped pattern, you may start by coloring each square sequentially, meaning you spend time needing to switch coloring pencils.

Create a function where given a list of colors cols, return how long it takes to color the whole pattern. Note the following times:

• It takes 1 second to switch between pencils.
• It takes 2 seconds to * color a square*.

See the example below for clarification.

color_pattern_times(["Red", "Blue", "Red", "Blue", "Red"]) ➞ 14

# There are 5 colors so it takes 2 seconds to color each one (2 x 5 = 10).
# You need to switch the pencils 4 times and it takes 1 second to switch (1 x 4 = 4).
# 10 + 4 = 14

Examples

color_pattern_times(["Blue"]) ➞ 2

color_pattern_times(["Red", "Yellow", "Green", "Blue"]) ➞ 11

color_pattern_times(["Blue", "Blue", "Blue", "Red", "Red", "Red"]) ➞ 13

Notes

• Only change coloring pencils if the next color is different to the color before it.
• Return a number in seconds.