View Compilation Error

0_0_32752754_15938.cpp: In function 'int main()':
0_0_32752754_15938.cpp:10:19: error: 'f' was not declared in this scope
   mp[i]=mp[i-1]*2-f[n-2];
                   ^
0_0_32752754_15938.cpp:10:21: error: 'n' was not declared in this scope
   mp[i]=mp[i-1]*2-f[n-2];
                     ^