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class Solution:
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    def isSelfCrossing(self, x):
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        n = len(x)
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        if n < 4:
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            return False
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        for i in range(3, n):
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            if x[i] >= x[i - 2] and x[i - 1] <= x[i - 3]:
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                return True
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            if i >= 4 and x[i - 1] == x[i - 3] and x[i] + x[i - 4] >= x[i - 2]:
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                return True
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            if (
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                i >= 5
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                and 0 <= x[i - 2] - x[i - 4] <= x[i]
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                and 0 <= x[i - 3] - x[i - 1] <= x[i - 5]
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            ):
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                return True
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        return False