题解 | #DNA序列#
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
s = input()
N = int(input())
ls = []
for i in range(0, len(s)):
ls.append(s[i : i + N])
#print(ls)
lst = []
for i in ls:
if len(i) == N:
lst.append(i)
#print(lst)
lsd = []
p = 0
for i in lst:
if ((i.count("G")) + (i.count("C"))) / len(i) > p:
lsd.append(((i.count("G")) + (i.count("C"))) / len(i))
print(lst[lsd.index(max(lsd))]) # 注意这个的写法
