题解 | #DNA序列#
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
import sys
x=list(input())
y=int(input())
ans=[]
for i in range(len(x)):
m=x[i:i+y].count('G')+x[i:i+y].count('C')
ans.append([m,i])
if m > ans[0][0] :
ans[0]=[m,i]
if m==y:
break
i=ans[0][1]
print(''.join(x[i:i+y]))
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