View Compilation Error

0_0_33715774_30668.cpp: In function 'void manacher()':
0_0_33715774_30668.cpp:49:28: error: 'pn' was not declared in this scope
         if(i-p[i]==0) begi[pn++]  = i;
                            ^
0_0_33715774_30668.cpp:50:32: error: 'ln' was not declared in this scope
         if(i+p[i]==len-1) tail[ln++] = i;
                                ^