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class Vector
{
public:
int x;
int y;
Vector (int ex, int why) : x {ex}, y {why} {}
Vector () : x {0}, y{0} {}
Vector& operator+= (Vector v) { x += v.x, y += v.y; return *this; }
Vector& operator-= (Vector v) { x -= v.x, y -= v.y; return *this; }
Vector& operator*= (Vector v) { x *= v.x, y *= v.y; return *this; }
};
Vector operator+ (Vector, Vector);
Vector operator- (Vector, Vector);
Vector operator* (Vector, Vector);
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