View Compilation Error

0_0_39560289_19976.cpp: In member function 'Mat Mat::operator*(Mat)':
0_0_39560289_19976.cpp:39:24: error: 'n' was not declared in this scope
   39 |         for(int i=1;i<=n+1;i++)
      |                        ^
0_0_39560289_19976.cpp: In member function 'void Mat::print()':
0_0_39560289_19976.cpp:46:24: error: 'n' was not declared in this scope
   46 |         for(int i=1;i<=n+1;i++){
      |                        ^
0_0_39560289_19976.cpp: In function 'Mat qpow(Mat, ll)':
0_0_39560289_19976.cpp:55:21: error: 'n' was not declared in this scope
   55 |     Mat ret;ret.one(n+1);
      |                     ^