Problem	doll_noi
User	jmuzhen
Submission Time	2025-02-17 20:47:26
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

doll_noi.cpp: In function ‘bool used(int)’:
doll_noi.cpp:8:14: error: ‘class std::set<int>’ has no member named ‘contains’
8 | return s.contains(x);
| ^~~~~~~~