View Compilation Error

0_0_38705884_15145.cpp:9:1: error: 'vector' does not name a type
    9 | vector<int> num;
      | ^~~~~~
0_0_38705884_15145.cpp: In function 'int find(int)':
0_0_38705884_15145.cpp:17:28: error: 'num' was not declared in this scope; did you mean 'sum'?
   17 |         return lower_bound(num.begin(), num.end(), x) - num.begin();
      |                            ^~~
      |                            sum
0_0_38705884_15145.cpp: In function 'int main()':
0_0_38705884_15145.cpp:26:17: error: 'num' was not declared in this scope; did you mean 'sum'?
   26 |                 num.clear();
      |                 ^~~
      |                 sum