IndexError: list index out of range stair algorithm

Question

I want to make an algorithm that counts how many stairs can guy jump from each stair. b is his jump height and c is height of each stair.

b = 7
c = [1, 2, 3, 4, 5, 4, 3, 2, 1]
indx = 1
indx1 = 1

for x in c:
    while x < b:
        if x + c[indx] < b:
            x = x + c[indx]
            indx += 1
            print(x)
        else:
            indx1 += 1
            indx = indx1

This code gives me this output: 3 Traceback (most recent call last): 6 File "file location*", line 9, in if x + c[indx] < b: IndexError: list index out of range

I don't know why it doesn't skip that if and doesn't go to the else statement...

Answer 1

I think you need make variable to hold threshold checker loop like this code:

if __name__ == "__main__":

  b = 7
  c = [1, 2, 3, 4, 5, 4, 3, 2, 1]
  indx = 0
  indx1 = 0

  stop = 0

  for x in c:
    while stop < b:
       result = x + c[indx]
       print("check jump {}".format(result))

       if result < b:
         x = result
         indx += 1
         print("jump {}".format(x))

       else:
         indx1 += 1
         indx = indx1
         print("not jump {}".format(indx))

       stop = stop + indx

I put a variable result is value after compute loop index for in. I hope that it would help you