公共子串和公共子序列是不同的
class maxstr():
def LCS(self,string1,string2):
len1 = len(string1)
len2 = len(string2)
res = [[0 for i in range(len1+1)] for j in range(len2+1)]
for i in range(1,len2+1):
for j in range(1,len1+1):
if string2[i-1] == string1[j-1]:
res[i][j] = res[i-1][j-1]+1
else:
res[i][j] = max(res[i-1][j],res[i][j-1])
return res,res[-1][-1]
aa=maxstr()
print(aa.LCS("helloworld","loop"))
class maxstr():
def LCstring(self,string1,string2):
len1 = len(string1)
len2 = len(string2)
res = [[0 for i in range(len1+1)] for j in range(len2+1)]
result = 0
for i in range(1,len2+1):
for j in range(1,len1+1):
if string2[i-1] == string1[j-1]:
res[i][j] = res[i-1][j-1]+1
result = max(result,res[i][j])
print(res)
return result
aa=maxstr()
print(aa.LCstring("helloworld","loop"))
[[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0],
[0, 0, 0, 0, 0, 2, 0, 1, 0, 0, 0],
[0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]
2