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View Compilation Error

0_0_1331559_1454.cpp: In function `double Dis(Point&, Point&)':
0_0_1331559_1454.cpp:35: error: `sqrt' undeclared (first use this function)
0_0_1331559_1454.cpp:35: error: (Each undeclared identifier is reported only once for each function it appears in.)


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