View Compilation Error

0_0_39064046_21925.cpp:2:17: error: expected initializer before 'n'
    2 | long long stint n)
      |                 ^
0_0_39064046_21925.cpp: In function 'int main()':
0_0_39064046_21925.cpp:19:21: error: 'st' was not declared in this scope; did you mean 'std'?
   19 |         long long r=st(n);
      |                     ^~
      |                     std