in的使用
作用一：判断列表是否包含某个元素
a = [1,2,3,4,5]
b = 5
c = 6
print(b in a)
print(c in a)
# True
# False
作用二：判断字符串是否包含某一个子串
a = "aacss"
b = "aa"
c = "css"
d = "sdsa"
print(b in a)
print(c in a)
print(d in a)
# True
# True
# False
in的使用 HJ75 公共子串计算
while True:
try:
a = input()
b = input()
if len(a)> len(b):
a, b = b, a
max_result = 0
# 双指针
for i in range(len(a)):
for j in range(i,len(a)):
if a[i:j+1] in b and j-i+1> max_result:
max_result = j-i+1
print(max_result)
except:
break
