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108. 分割回文串 II
给定一个字符串s,将s分割成一些子串,使每个子串都是回文。
返回s符合要求的的最少分割次数。
样例
比如,给出字符串s = "aab",
返回 1, 因为进行一次分割可以将字符串s分割成["aa","b"]这样两个回文子串
解题思路:
class Solution:
"""
@param s: A string
@return: An integer
"""
def minCut(self, s):
# write your code here
Palin = self.isPalindrom(s)
dp = [float('inf')] * (len(s) + 1)
dp[0] = 0
for i in range(1, len(s)+1):
for j in range(i):
if Palin[j][i-1]:
dp[i] = min(dp[j] + 1, dp[i])
return dp[len(s)] - 1
def isPalindrom(self, s):
n = len(s)
dp = [[False] * n for _ in range(n)]
for mid in range(n):
i = j = mid
while i >= 0 and j <= n-1 and s[i] == s[j]:
dp[i][j] = True
i -= 1
j += 1
i = mid
j = mid + 1
while i >= 0 and j <= n-1 and s[i] == s[j]:
dp[i][j] = True
i -= 1
j += 1
return dp