python leetcod 115. Distinct Subsequences
dp[i][j]表示s[:j]與t[:i]的匹配程度,字串的DP一般都是這樣設定,然後就是動態轉移方程的設定
class Solution:
def numDistinct(self, s, t):
"""
:type s: str
:type t: str
:rtype: int
"""
m=len(t)
n=len(s)
dp=[[1]*(n+1)]
dp+=[[0]*(n+1) for _ in range(m)]
for i in range(1,m+1):
for j in range(1,n+1):
if t[i-1]==s[j-1]:
dp[i][j]=dp[i-1][j-1]+dp[i][j-1]
else:
dp[i][j]=dp[i][j-1]
return dp[m][n]
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python leetcod 115. Distinct Subsequences
dp[i][j]表示s[:j]與t[:i]的匹配程度,字串的DP一般都是這樣設定,然後就是動態轉移方程的設定 class Solution: def numDistinct(self, s, t): """ :type s: str
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