无放回抽样(Sampling without replacement)

import sys
import random
import stdarray
import stdio
m = int(sys.argv[1])
n = int(sys.argv[2])

# Initialize array perm = [0,1,...,n-1]

perm = stdarray.create1D(n, 0)
for i in range(n):
    perm[i] = i
# Create a random sample of size m in perm[0,..m)

for i in range(m):
    r = random.randrange(i, n)
# Exchange perm[i] and perm[r].

    temp = perm[r]
    perm[r] = perm[i]
    perm[i] = temp
# Write the results.

for i in range(m):
    stdio.write(str(perm[i]) + ' ')
stdio.writeln()