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import random | |
import math | |
import time | |
n = 9999 | |
val = range(1, n+1) | |
random.shuffle(val) | |
def get_ptr(v): | |
if v < n: | |
return val.index(v+1)+1 | |
else: | |
return 0 | |
ptr = map(get_ptr, val) | |
head = val.index(1) | |
def search(x, i): | |
while x > val[i]: | |
i = ptr[i]-1 | |
return i+1 | |
def a(x): | |
return search(x, head) | |
def b(x): | |
i = head | |
max = val[i] | |
for j in range(int(math.sqrt(n))): | |
if max < val[j] <= x: | |
i = j | |
max = val[j] | |
return search(x, i) | |
def c(x): | |
i = head | |
max = val[i] | |
sqrt_n = int(math.sqrt(n)) | |
group_i = random.randint(0, sqrt_n) | |
for j in range(sqrt_n): | |
index = j*sqrt_n+group_i | |
y = val[index] | |
if max < y <= x: | |
i = index | |
max = y | |
return search(x, i) | |
def d(x): | |
i = random.randint(0, n-1) | |
y = val[i] | |
if x < y: | |
return search(x, head) | |
if x > y: | |
return search(x, ptr[i]) | |
def calc_time(func): | |
start = time.time() | |
for num in range(1, n+1): | |
func(num) | |
end = time.time() | |
print "took %.2f seconds" % (end-start) |
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