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View Compilation Error

0_0_12385630_9424.cpp: In function `double cal_area(Point, Point, Point, double)':
0_0_12385630_9424.cpp:33: error: no match for 'operator-' in 'a - c'
0_0_12385630_9424.cpp:33: error: no match for 'operator-' in 'b - c'


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