hackerrank Most Common

题目：https://www.hackerrank.com/challenges/most-commons/problem
题意：按照次数升序，次数相同降序
思路：s = sorted(Counter(input()).items(), key= lambda x: (-x[1],x[0]))[:3]
详细可见python dict sorted 排序
代码：

'''
-*- coding: utf-8 -*-
@Author  : PlayerGuan
@Time    : 2017/10/14 23:12
@Software: PyCharm Community Edition
@File    : main.py
'''
from collections import Counter

s = sorted(Counter(input()).items(), key= lambda x: (-x[1],x[0]))[:3]
for x in s:
    print(x[0]+" "+str(x[1]))