829. 模拟队列

https://www.acwing.com/problem/content/submission/code_detail/7414626/

AcWing/829/829.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int m, x;
+string op;
+queue<int> q;
+
+int main() {
+    cin >> m;
+    while (m--) {
+        cin >> op;
+        if (op == "push") {
+            cin >> x;
+            q.push(x);
+        } else if (op == "pop") {
+            q.pop();
+        } else if (op == "empty") {
+            cout << (q.empty() ? "YES" : "NO") << endl;
+        } else {
+            cout << q.front() << endl;
+        }
+    }
+    return 0;
+}