Leetcode| 1143. 最长公共子序列、1035. 不相交的线 Day53

1143. Longest Common Subsequence

dp[i][j]：长度为[0, i - 1]的字符串text1与长度为[0, j - 1]的字符串text2的最长公共子序列为dp[i][j]

和718. 最长重复子数组 很像，区别在于不要求连续。

class Solution:
    def longestCommonSubsequence(self, text1: str, text2: str) -> int:
        dp = [[0] * (len(text2) + 1) for _ in range((len(text1) + 1))]

        for i in range(1, len(text1) + 1):
            for j in range(1, len(text2) + 1):
                if text1[i - 1] == text2[j - 1]:
                    dp[i][j] = dp[i - 1][j - 1] + 1
                else:
                    dp[i][j] = max(dp[i - 1][j], dp[i][j - 1])

        return max(map(max, dp))

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1035. Uncrossed Lines

和1143. 一样，找最长公共子序列

class Solution:
    def maxUncrossedLines(self, nums1: List[int], nums2: List[int]) -> int:
        dp = [[0] * (len(nums2) + 1) for _ in range((len(nums1) + 1))]

        for i in range(1, len(nums1) + 1):
            for j in range(1, len(nums2) + 1):
                if nums1[i - 1] == nums2[j - 1]:
                    dp[i][j] = dp[i - 1][j - 1] + 1
                else:
                    dp[i][j] = max(dp[i - 1][j], dp[i][j - 1])

        return max(map(max, dp))