0_0_6522759_7520.cpp:40: error: `main' must return `int'
0_0_6522759_7520.cpp: In function `int main(...)':
0_0_6522759_7520.cpp:60: error: `abs' undeclared (first use this function)
0_0_6522759_7520.cpp:60: error: (Each undeclared identifier is reported only once for each function it appears in.)
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