View Compilation Error

0_0_7577725_28236.cpp: In function `int Find(int, int, int, int, int)':
0_0_7577725_28236.cpp:6: error: `abs' undeclared (first use this function)
0_0_7577725_28236.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)