View Compilation Error

0_0_25898247_3700.cpp: In function 'int main()':
0_0_25898247_3700.cpp:65:6: error: 'LL' was not declared in this scope
      LL f1_=(b[0][0]*f1+b[1][0]*f2+b[2][0])%mod;
      ^
0_0_25898247_3700.cpp:66:9: error: expected ';' before 'f2_'
      LL f2_=(f1*b[0][1]+f2*b[1][1]+b[2][1])%mod;
         ^
0_0_25898247_3700.cpp:67:9: error: 'f1_' was not declared in this scope
      f1=f1_;
         ^
0_0_25898247_3700.cpp:68:9: error: 'f2_' was not declared in this scope
      f2=f2_;
         ^