View Compilation Error

0_0_25863700_1568.cpp: In function 'll solve2(ll, ll, ll, ll, int, ll)':
0_0_25863700_1568.cpp:52:14: error: 'f2' was not declared in this scope
    A.m[0][0]=f2;
              ^
0_0_25863700_1568.cpp:53:14: error: 'f1' was not declared in this scope
    A.m[0][1]=f1;
              ^
0_0_25863700_1568.cpp:87:14: error: 'f2' was not declared in this scope
    A.m[0][0]=f2;
              ^
0_0_25863700_1568.cpp:88:14: error: 'f1' was not declared in this scope
    A.m[0][1]=f1;
              ^
0_0_25863700_1568.cpp:109:9: error: 'f2' was not declared in this scope
  return f2;
         ^