/in/foo.cc: In function 'int main()':
/in/foo.cc:24:4: error: expected ';' before 'else'
    else f[i][i] = max(f[i][j], f[i-1][a[i]-j]+j);
    ^~~~
/in/foo.cc:26:7: error: 'n' was not declared in this scope
  if(f[n][0] > 0) cout << f[n][0] << endl;
       ^