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View Compilation Error

0_0_2827833_2094.cpp: In function `point barycenter(int, point*)':
0_0_2827833_2094.cpp:45: error: `fabs' undeclared (first use this function)
0_0_2827833_2094.cpp:45: error: (Each undeclared identifier is reported only once for each function it appears in.)


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