Your calculation for IP address is wrong. Note there are 256 IP addresses from 10.0.0.0 to 10.0.0.255, and 256 also from 10.0.1.0 to 10.0.1.255, now try to compute that for each subset.

https://stackoverflow.com/questions/134934/display-number-with-leading-zeros

i mean, have you tried it on your computer ? check out the sample tests, there is a call zeros(1000000000). run that on your computer and see how that goes...

the description tells you exactly why your current approach will not work.

please make sure to read the description carefully before raising issues...

you are iterating on an list with a foreach loop while modifying it at the same time, this is very rarely a good thing to do, as it results in code that is hard to understand and a high probability of bugs. in some scenarios, you effectively delete some elements before they have been looped on, e.g. consider:

["two2", "one1"] --> after the first iteration of your loop, this will be converted to ["two2", "two2"]. "one1" never gets iterated on.

• asking for help is not a kata issue, please ask questions instead
• on Codewars, you need to return your result, not merely print it, otherwise the tests will not find it
• your code should return a tuple, not a list
• "It should find two different items" --> your code sometimes yields identical indices