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4 changes: 2 additions & 2 deletions docs/chapter_stack_and_queue/summary.md
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Expand Up @@ -27,5 +27,5 @@
使用两个栈，栈 `A` 用于撤销，栈 `B` 用于反撤销。

1. 每当用户执行一个操作，将这个操作压入栈 `A` ，并清空栈 `B` 。
2. 当用户执行“撤销”时，从栈 `A` 中弹出最近的操作，并将其压入栈 `B` 。
3. 当用户执行“反撤销”时，从栈 `B` 中弹出最近的操作，并将其压入栈 `A` 。
2. 当用户启用“撤销”功能时，从栈 `A` 中弹出最近的操作，并将其压入栈 `B` 。
3. 当用户启用“反撤销”功能时，从栈 `B` 中弹出最近的操作，并将其压入栈 `A` 。