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            Uriel's Corner

            Research Associate @ Harvard University / Research Interests: Computer Vision, Biomedical Image Analysis, Machine Learning
            posts - 0, comments - 50, trackbacks - 0, articles - 594
            一列數字,求問是否可以切割成若干片,使得每一片滿足以下之一:
            1.The subarray consists of exactly 2 equal elements. For example, the subarray [2,2] is good.
            2.The subarray consists of exactly 3 equal elements. For example, the subarray [4,4,4] is good.
            3.The subarray consists of exactly 3 consecutive increasing elements, that is, the difference between adjacent elements is 1. For example, the subarray [3,4,5] is good, but the subarray [1,3,5] is not.

            DP

             1 #2369
             2 #Runtime: 817 ms (Beats 85.71%)
             3 #Memory: 26.2 MB (Beats 100%)
             4 
             5 class Solution(object):
             6     def validPartition(self, nums):
             7         """
             8         :type nums: List[int]
             9         :rtype: bool
            10         """
            11         dp = [0] * (len(nums) + 1)
            12         dp[0] = 1
            13         for i in range(1, len(nums)):
            14             if i == 1:
            15                 if nums[i - 1] == nums[i]:
            16                     dp[i + 1] = 1
            17                 continue
            18             if nums[i] == nums[i - 1]:
            19                 dp[i + 1] |= dp[i - 1]
            20             if nums[i] == nums[i - 1] == nums[i - 2]:
            21                 dp[i + 1] |= dp[i - 2]
            22             if nums[i] == nums[i - 1] + 1 == nums[i - 2] + 2:
            23                 dp[i + 1] |= dp[i - 2]
            24         return dp[-1]
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