View Compilation Error

0_0_39055761_4616.cpp: In function 'int main()':
0_0_39055761_4616.cpp:10:39: error: 'v' was not declared in this scope
   10 |             for (int i=3;i<n;i++) if (v[i]<v[i-1]+v[i-2]) ans=max(ans,v[i]+v[i-1]+v[i-2]);
      |                                       ^
0_0_39055761_4616.cpp:11:19: error: 'mx' was not declared in this scope
   11 |             cout<<mx<<'\n';
      |                   ^~