project-euler/112_bouncy_numbers.py

#!/usr/bin/env python3

# Brute force

def main(x):
    i = 100
    bc = 0
    while 100*bc // i != x:
        i += 1
        bc += is_bouncy(i)
    return i

def is_bouncy(n):
    n = list(str(n))
    s = sorted(n)
    return n != s and n[::-1] != s

print(main(99))