0_0_8355752_2506.cpp: In function `int thc(int)':
0_0_8355752_2506.cpp:11: error: `abs' undeclared (first use this function)
0_0_8355752_2506.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8355752_2506.cpp: In function `int main()':
0_0_8355752_2506.cpp:41: error: `abs' undeclared (first use this function)
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