bailong360

from itertools import permutations

for digits in permutations((str(x) for x in range(10)), 6):
    if digits[0] == '0':
        continue
    num = int("".join(digits))
    square = num ** 2
    if not set(str(square)) & set(digits):
        print(num)
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结果

203879
639172
CPU times: user 304 ms, sys: 0 ns, total: 304 ms
Wall time: 304 ms
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选 Python 主要是标准库里有 permutations, 省事儿 (