题解 | #DNA序列#
#可能比较耗时但很短的代码
gene = input()
l = int(input())
rate = []
for i in range(len(gene)):
rate.append(gene[i:min(i+l,len(gene))].count('C')+gene[i:min(i+l,len(gene))].count('G'))
print(gene[rate.index(max(rate)):rate.index(max(rate))+l])
#可能比较耗时但很短的代码
gene = input()
l = int(input())
rate = []
for i in range(len(gene)):
rate.append(gene[i:min(i+l,len(gene))].count('C')+gene[i:min(i+l,len(gene))].count('G'))
print(gene[rate.index(max(rate)):rate.index(max(rate))+l])
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