View Compilation Error

0_0_6258285_20530.cpp: In function `void getnext(int)':
0_0_6258285_20530.cpp:15: error: `p' undeclared (first use this function)
0_0_6258285_20530.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6258285_20530.cpp: In function `int KMP(int, int)':
0_0_6258285_20530.cpp:25: error: `j' undeclared (first use this function)
0_0_6258285_20530.cpp:27: error: `p' undeclared (first use this function)