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"""
The Computer Language Benchmarks Game
http://benchmarksgame.alioth.debian.org/
Contributed by Sokolov Yura, modified by Tupteq.
"""
DEFAULT_ARG = 9
def fannkuch(n):
count = list(range(1, n + 1))
max_flips = 0
m = n - 1
r = n
perm1 = list(range(n))
perm = list(range(n))
perm1_ins = perm1.insert
perm1_pop = perm1.pop
while 1:
while r != 1:
count[r - 1] = r
r -= 1
if perm1[0] != 0 and perm1[m] != m:
perm = perm1[:]
flips_count = 0
k = perm[0]
while k:
perm[: k + 1] = perm[k::-1]
flips_count += 1
k = perm[0]
if flips_count > max_flips:
max_flips = flips_count
while r != n:
perm1_ins(r, perm1_pop(0))
count[r] -= 1
if count[r] > 0:
break
r += 1
else:
return max_flips
def run_benchmark():
arg = DEFAULT_ARG
fannkuch(arg)
if __name__ == "__main__":
run_benchmark()
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