foo.cc: In function 'll C(int, int)':
foo.cc:13:5: error: 'vector' was not declared in this scope
     vector<ll> dp(m+1);
     ^~~~~~
foo.cc:13:5: note: suggested alternative: 'perror'
     vector<ll> dp(m+1);
     ^~~~~~
     perror
foo.cc:13:14: error: expected primary-expression before '>' token
     vector<ll> dp(m+1);
              ^
foo.cc:13:16: error: 'dp' was not declared in this scope
     vector<ll> dp(m+1);
                ^~

[Hydro](https://hydro.ac)提供评测服务