complete 2161.py 2164.py 10845.py 18258.py

zeta_python/completed/18258.py

@@ -0,0 +1,36 @@
+import sys
+from collections import deque
+
+queue = deque()
+
+
+def dispatch(command: str, *args):
+    if command == "push":
+        queue.append(int(args[0]))
+    elif command == "pop":
+        if queue:
+            return queue.popleft()
+        else:
+            return -1
+    elif command == "size":
+        return len(queue)
+    elif command == "empty":
+        return 0 if queue else 1
+    elif command == "front":
+        if queue:
+            return queue[0]
+        else:
+            return -1
+    elif command == "back":
+        if queue:
+            return queue[-1]
+        else:
+            return -1
+
+
+if __name__ == "__main__":
+    N = int(sys.stdin.readline())
+    for _ in range(N):
+        d = dispatch(*sys.stdin.readline().strip().split())
+        if d is not None:
+            print(d)