# For 1, 1, 0, 0, 1, 1, 0, 0, 1 what should be expected ? 2 or 4?

#1

Here i think only two switches are sufficient.
if 2 and 6 should be turned on. therefore 3 and 7 will also light up therefore all will be ON

#2

If you start from the first element, the traversal would be like this.

Now you turn **3rd Switch on. ** total_changes: 1

It will change the states of elements on the right of 3rd.

So states will now become 1,1,1,1,0,0,1,1,0

Make 5th Switch on. total_changes: 2
Changes element to right of 5th : 1,1,1,1,1,1,0,0,1

6th Switch is on. Move ahead.
Make 7th Switch on. total_changes:3
Changes element on right of 7th : 1,1,1,1,1,1,1,1,0

8th Switch is on. Move ahead.
9th Switch is off. Make it on. total_changes :4

#3

The expected output is 4. When in doubt, do make use of the expected output green button.

#4

hi , please see it says turning on or off the switch of a particular bulb , affects the state of "all the bulbs right to it "

So its not one single bulb but all the bulbs right to it.

#5

this will require 4 switches to be onâ€¦

#6

Found a Simple O(N) and O(1) space solution https://youtu.be/sW8g40nZrwg