Problem	alienalien
User	Yifei1234
Submission Time	2023-08-16 16:33:07
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

alienalien.cpp: In function ‘int main()’:
alienalien.cpp:20:21: error: ‘a’ was not declared in this scope
20 | vector<bool>alien(a,0);
| ^
alienalien.cpp:28:1: error: ‘else’ without a previous ‘if’
28 | else{
| ^~~~