I just failed my coding test...heres the passing solution

So I just failed my coding test due to running out of time. It was one of those codility tests only 70 minutes and 3 different problems, I passed on the first 2 questions however I ran out of time with the 3rd problem.

Here is the question that gave me issues

initially I assumed we would need to use the sliding window technique to get the contiguous 'x' and measure from there and I hacked at that solution for about 20 minutes but in the final 5 minutes out of pure desperation and need i came up with another solution that i did not get to fully flesh out in the official test.

The idea of the solution is in 3 simple broken up steps,

1. separate the contiguous x
2. sort by length
3. decrement from your budget

this solution is magnitudes simpler to comprehend and a LOT easier to read. I may not have gotten the ability to benefit from coming up with this solution but hopefully someone reading this in the future will.

here it is in python

def solution(S, B):
    # Implement your solution here
    count = 0

    #sliding window technique needed
    arr = []
    temparr = []
    for index in S:
        if index == "x":
            temparr.append(index)
        else:
            arr.append(len(temparr))
            temparr = []
    arr = sorted(arr)
    index = len(arr)-1
    while B > 0 or index == 0:
      if B >= arr[index]+1:
        B -= arr[index]+1
        count += arr[index]
      index -= 1
    return count