#找出最长公共前缀
strs = ["dog","racecar","car"] #"" strs = ["flower","flow","flight"] #"fl"
方法一：
lenstrs=[]
for i in strs:
lenstrs.append(len(i))
lenstrs=sorted(lenstrs,reverse=False)
print(lenstrs[0])
strlistzong=[]
#3 代表列表中最短的字符串
for j in range(3):
strlist = []
for i in strs:
strlist.append(i[j])
strlist=sorted(strlist)
if strlist[0]==strlist[-1]:
strlistzong.append(strlist[0])
print(‘‘.join(strlistzong))
方法二：
def longestCommonPrefix(strs):
if not strs: return ""
#s1是从小到头排序 s2从大到小排序
s1 = min(strs)
s2 = max(strs)
for i, x in enumerate(s1):
# i是索引 x是数据
print(i,x)
if x != s2[i]:
return s2[:i]
return s1
print(longestCommonPrefix(strs))
方法三：
#zip 组成2维数组
print(list(zip(*strs)))
#去重
setstrs=list(map(set,(zip(*strs))))
print(setstrs)
resstrs=‘‘
for x in setstrs:
if len(list(x))==1:
resstrs += list(x)[0]
print(resstrs)