'commit'

TangDou/AcWing/Queue/829_2.cpp

@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+const int N = 1e5 + 10;
+int q[N], hh, tt;
+int main() {
+    int n;
+    cin >> n;
+    while (n--) {
+        string op;
+        cin >> op;
+        if (op == "push") {
+            cin >> q[++tt];
+            if (tt == N) tt = 0; // 加冒了，就回到0
+        } else if (op == "empty")
+            hh == tt ? cout << "YES" << endl : cout << "NO" << endl;
+        else if (op == "query")
+            printf("%d\n", q[hh]);
+        else {
+            hh++;
+            if (hh == N) hh = 0; // 加冒了，就回到0
+        }
+    }
+    return 0;
+}