Problem	missingnumber
User	Junxian
Submission Time	2026-03-16 11:46:05
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

missingnumber.cpp: In function ‘int main()’:
missingnumber.cpp:11:10: error: ‘a’ was not declared in this scope
11 | cin >> a;
| ^