题解 | DNA序列

sl = {}
ll  = {}
while True:
    try:
        s,l = input(),int(input())
        ls = len(s)
        lis = []
        for i in s:
            lis.append(i)
        #print(lis[0:2])
        for i in range(ls):
            sl[i] = (lis[i:i+l].count('G') + lis[i:i+l].count('C'))/l
            ll[i] = lis[i:i+l]
        max_value = max(sl.values())
        max_key_1 = 0
        for m,n in sl.items():
            if n == max_value:
                max_key_1 = m
                break
        print(''.join(ll[max_key_1]))
    except:
        break