擅长:python、mysql、java
<p>好吧,你想要组合:</p>
<pre><code>from itertools import combinations
def all_combinations(iterable):
for r in range(len(digits)):
yield from combinations(digits, r+1)
</code></pre>
<p>你想把它们转换成整数:</p>
^{pr2}$
<p>你想把它们相加:</p>
<pre><code>sum(map(digits_to_int, all_combinations([4, 5, 6])))
</code></pre>
<p><em>然后</em>关注速度。在</p>