Problem	missingnumber
User	carson
Submission Time	2025-08-27 15:54:41
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

missingnumber.cpp:2:1: error: ‘ysing’ does not name a type
2 | ysing namespace std;
| ^~~~~
missingnumber.cpp: In function ‘int main()’:
missingnumber.cpp:5:2: error: ‘cin’ was not declared in this scope; did you mean ‘std::cin’?
5 | cin >> n;
| ^~~
| std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:75,
from missingnumber.cpp:1:
/usr/include/c++/9/iostream:60:18: note: ‘std::cin’ declared here
60 | extern istream cin; /// Linked to standard input
| ^~~
missingnumber.cpp:6:2: error: ‘vector’ was not declared in this scope
6 | vector<int> arr(n);
| ^~~~~~
missingnumber.cpp:6:2: note: suggested alternatives:
In file included from /usr/include/c++/9/vector:67,
from /usr/include/c++/9/functional:62,
from /usr/include/c++/9/pstl/glue_algorithm_defs.h:13,