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class Solution {
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 public:
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  bool isBoomerang(vector<vector<int>> &points) {
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    if (points.size() <= 2) return false;
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    int x0 = points[0][0], y0 = points[0][1];
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    int x1 = points[1][0], y1 = points[1][1];
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    int x2 = points[2][0], y2 = points[2][1];
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    int dx1 = x1 - x0, dy1 = y1 - y0;
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    int dx2 = x2 - x1, dy2 = y2 - y1;
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    if (dy1 * dx2 == dy2 * dx1) return false;
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    return true;
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  }
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};