just else and one x.count are extra. Much better to call functoin once.

If there are no good ideas ("as is often the case") then it traverses array only once.

This always traverses array two full times.

Yes, it was.

Solution too slow?

I'm getting this error -

Process exited prematurely with a SIGKILL signal.

What does this mean?

Since you can print the input, check with specific test is failing.

Your code has problems with big numbers. There are no zeroes in the random tests, so that's not a problem.

Thx Chrono

got it. Thanks :)

11 (and the others) is not a substring. You're removing the middle numbers. A substring is formed with neighboring digits.

It's written

Given a string of integers, return the number of odd-numbered substrings that can be formed.

For example, in the case of "1341", they are 1, 1, 3, 13, 41, 341, 1341, a total of 7 numbers. 

But why not other combinations like -

11, 131, 141, 31

Am I missing something?

Awesome!