Count Lattice Points Inside a Circle LeetCode solution in Python

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class Solution:
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    def countLatticePoints(self, c: List[List[int]]) -> int:
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        ans, m = 0, [0] * 40401
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        c = set(((x, y, r) for x, y, r in c))
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        for x, y, r in c:
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            for i in range(x - r, x + r + 1):
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                d = int(sqrt(r * r - (x - i) * (x - i)))
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                m[i * 201 + y - d : i * 201 + y + d + 1] = [1] * (d + d + 1)
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        return sum(m)