View Compilation Error

0_0_2471228_31125.cpp: In function `int main()':
0_0_2471228_31125.cpp:13: error: `abs' undeclared (first use this function)
0_0_2471228_31125.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2471228_31125.cpp:15: error: expected `)' before "max"