View Compilation Error

0_0_34234430_19329.cpp: In function 'long long unsigned int askhash(int, int)':
0_0_34234430_19329.cpp:25:34: error: 'ha' was not declared in this scope
 ull askhash(int l,int r) {return ha[r]-ha[l-1]*po[r-l+1];}
                                  ^
0_0_34234430_19329.cpp:25:48: error: 'po' was not declared in this scope
 ull askhash(int l,int r) {return ha[r]-ha[l-1]*po[r-l+1];}
                                                ^