题解 | #DNA序列#
DNA序列
http://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
def ratio(s):
return (s.count("G")+s.count("C"))/len(s)
while True:
try:
n=0
s=input().strip()
l=int(input())
str_list=[]
for i in range(len(s)-l+1):
if ratio(s[i:i+l])>n:
str_list.append(s[i:i+l])
n=ratio(s[i:i+l])
print(str_list[-1])
except:
break
