Problem	doll_noi
User	Karax
Submission Time	2026-08-28 14:53:37
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

cc1plus: error: ‘::main’ must return ‘int’
doll_noi.cpp: In function ‘int main()’:
doll_noi.cpp:21:9: error: ‘chain_ends’ was not declared in this scope
21 | chain_ends.insert(a);
| ^~~~~~~~~~