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View Compilation Error

0_0_39356652_8511.cpp: In function 'int is_g180_degree(long long int, long long int, long long int, long long int)':
0_0_39356652_8511.cpp:9:24: error: 'y0' was not declared in this scope; did you mean 'x0'?
    9 |         if (x0*y1 - x1*y0 < 0)
      |                        ^~
      |                        x0


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