0_0_4607361_11620.cpp: In function `int cmp(double)':
0_0_4607361_11620.cpp:10: error: `fabs' undeclared (first use this function)
0_0_4607361_11620.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4607361_11620.cpp: In function `int main()':
0_0_4607361_11620.cpp:39: error: `sqrt' undeclared (first use this function)
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