thanks i get it now

added a note:

Note that we're looking for the total degrees of rotation, regardless of the direction of rotation. For instance, if you rotated 720° clockwise and 360° counter-clockwise, the total is 1080°.

done

approved

how many degrees is the dial rotated in total (clockwise plus counter-clockwise) in opening the lock?

I was taking the difference between rotating right and rotating left, but we are expected to ignore direction, and just some all of it together. I suppose noone else misread the description like I did ..

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You not wrong, the clock's direction is wrong!

In my world the clock turns in the opposite diretion.

In my world the clock turns in the opposite diretion.

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Sorry, i still don't get it. Why rotating the dial clockwise (instruction step#2) from zero to 30 will take 90 degrees;

I am not sure what is the way to calculate the degree.

I just think the formula should be:

With clockwise start from 0:

0 -> 10 : 90 degree

0 -> 20: 180 degree

0 -> 30: 270 degree

With counter-clockwise start from 0:

0 -> 30: 90 degree

0 -> 20: 180 degree

0 -> 10: 270 degree

Can any one explain what's wrong with my formula?

------UPDATE------

After researching for a while, i realize my assumption is wrong.

The formula should be opposited base on the picture.

https://www.art-of-lockpicking.com/wp-content/uploads/Open-a-Locker-Lock-Step-1.webp

It help me visual the problem easily more than the image in task.

Cool kata, but cool head is important for a cool finish!!

Thank, you very much!

Hi, Quark Fox!

Have a look at the example (0, 30, 0, 30) once again:

1. rotating the dial clockwise (instruction step#2) from zero to 30 will take 90 degrees;
2. rotating the dial counter-clockwise (instruction step#4) from 30 to zero will take another 90 degrees;
3. then again, rotating the dial clockwise (instruction step#5) from zero to 30 will take 90 degrees;

According to the instruction steps(#1, #3) you have a value of 360 times 2(#1) + 360(#3), which is 1080.
Now add this to 90*3 and you get 1350.

Hope that helps.