View Compilation Error

0_0_18528818_30712.cpp: In function 'void NTT(int*, int, int)':
0_0_18528818_30712.cpp:91:45: error: 'll' was not declared in this scope
 if(t==-1)for(int i=0,j=inv[n];i<n;i++)a[i]=(ll)a[i]*j%P;
                                             ^