View Compilation Error

0_0_25640215_512.cpp:6:6: error: 'tmax' was not declared in this scope
 ll f[tmax],ans[20];
      ^
0_0_25640215_512.cpp: In function 'void sove()':
0_0_25640215_512.cpp:14:5: error: 'f' was not declared in this scope
     f[0]=1;
     ^
0_0_25640215_512.cpp: In function 'int main()':
0_0_25640215_512.cpp:66:16: error: 'f' was not declared in this scope
         memset(f,0,sizeof(f));
                ^