diff --git a/zeta_python/completed/10845.py b/zeta_python/completed/10845.py
new file mode 100644
index 0000000..6bb2a30
--- /dev/null
+++ b/zeta_python/completed/10845.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)
diff --git a/zeta_python/completed/18258.py b/zeta_python/completed/18258.py
new file mode 100644
index 0000000..6bb2a30
--- /dev/null
+++ b/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)
diff --git a/zeta_python/completed/2161.py b/zeta_python/completed/2161.py
new file mode 100644
index 0000000..15de788
--- /dev/null
+++ b/zeta_python/completed/2161.py
@@ -0,0 +1,21 @@
+from collections import deque
+
+
+def solve(N):
+    queue = deque(range(1, N + 1))
+    cnt = 1
+    ret = []
+    while len(queue) != 1:
+        if cnt % 2 == 0:
+            queue.append(queue.popleft())
+        else:
+            ret.append(queue.popleft())
+        cnt += 1
+        cnt %= 2
+
+    ret.append(queue[0])
+    return " ".join(map(str, ret))
+
+
+if __name__ == "__main__":
+    print(solve(int(input())))
diff --git a/zeta_python/completed/2164.py b/zeta_python/completed/2164.py
new file mode 100644
index 0000000..0b0c542
--- /dev/null
+++ b/zeta_python/completed/2164.py
@@ -0,0 +1,19 @@
+from collections import deque
+
+
+def solve(N):
+    queue = deque(range(1, N + 1))
+    cnt = 1
+    while len(queue) != 1:
+        if cnt % 2 == 0:
+            queue.append(queue.popleft())
+        else:
+            queue.popleft()
+        cnt += 1
+        cnt %= 2
+
+    return queue.pop()
+
+
+if __name__ == "__main__":
+    print(solve(int(input())))