0_0_2857682_7878.cpp:2:18: cmath.h: No such file or directory
0_0_2857682_7878.cpp: In function `int main()':
0_0_2857682_7878.cpp:27: error: `abs' undeclared (first use this function)
0_0_2857682_7878.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)
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