View Compilation Error

0_0_29540999_1592.cpp: In function 'void manacher()':
0_0_29540999_1592.cpp:21:39: error: 'p' was not declared in this scope
   while(Ma[i+Mp[i]]==Ma[i-Mp[i]]&&h[i-p[i]]<=h[i-p[i+2]]) Mp[i]++;
                                       ^