Problem	trains
User	Xrh999
Submission Time	2026-02-07 06:41:16
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

trains.cpp: In function ‘int main()’:
trains.cpp:21:10: error: ‘thing’ was not declared in this scope
21 | cout << thing.back() << '\n';
| ^~~~~