Problem	zooqueue
User	shenxy13
Submission Time	2023-06-26 06:55:50
Score	0
Max Time	N/A
Max Memory	N/A

Compile Error

zooqueue.cpp: In function ‘int main()’:
zooqueue.cpp:14:38: error: ‘class std::stack<int>’ has no member named ‘back’
14 | while (!st.empty() && H[ptr] == st.back()) st.pop(), ++ptr;
| ^~~~