题解 | #DNA序列#
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
s = input()
n = int(input())
dic = {}
radio = 0
for i in range(len(s)):
if i + n <= len(s):
radio = (s[i : i + n].count("C") + s[i : i + n].count("G")) / n
dic[s[i : i + n]] = radio
dic_sort = sorted(dic.items(), key=lambda x: x[1], reverse=True)
print(dic_sort[0][0])
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