题解 | #DNA序列#
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
string = input()
n = int(input())
max_count = 0
result = ''
for i in range(len(string) - n + 1):
substring = string[i:i+n]
count = 0
for char in substring:
if char == "G" or char == "C":
count += 1
if count > max_count:
max_count = count
result = substring
print(result)
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