擅长:python、mysql、java
<p>你试过了吗</p>
<pre class="lang-py prettyprint-override"><code>from collections import Counter
def check(v):
return len(set(Counter(v).values())) <= 1
assert check("aabb")
assert check("aabbcc")
assert check("1122")
assert check("aaaaBBBB9999$$$$")
assert check("")
assert not check("korara")
assert not check("33211")
</code></pre>