0_0_1496086_1300.cpp: In function `bool intersect(const Point&, const Point&)':
0_0_1496086_1300.cpp:19: error: `sgn' undeclared (first use this function)
0_0_1496086_1300.cpp:19: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1496086_1300.cpp: In function `int main()':
0_0_1496086_1300.cpp:22: error: too few arguments to function `void check(int, int)'
0_0_1496086_1300.cpp:58: error: at this point in file
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