题解 | #正则匹配#
字符统计
http://www.nowcoder.com/practice/c1f9561de1e240099bdb904765da9ad0
import sys from collections import Counter for line in sys.stdin: c=Counter(line.strip()) d={i:[] for i in set(c.values())} for k,v in c.items(): d[v].append(k) dd=dict(sorted(d.items(), key=lambda _ :_[0],reverse=True)) ss='' for k,v in dd.items(): dd.update({k:sorted(v,reverse=False)}) ss+=''.join(dd[k]) print(ss)
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