{"topic":{"id":7184,"title":"找一个一起学 CS61B 的同学","slug":"topic","categoryId":4,"createdAt":"2023-11-13 05:32:31.058099","bumpedAt":"2023-11-23 17:17:53.863768","views":688,"postsCount":48,"highestPostNumber":52,"likeCount":52,"closed":false,"pinned":false,"excerpt":"大二，不是西交学生，想补一补数据结构兼带练一练 java。最近在看 21sp 的 lab2，天资愚钝，一个人学习有点痛苦，有点交流可能会好得多，哪怕聊聊天也是好的 🥲","deletedAt":null,"isAnonymous":false,"category":{"id":4,"name":"谈笑风生","slug":"general","color":"25AAE2"},"author":{"id":1628,"username":"Lorange","name":"主治医师李大华","avatarUrl":"/uploads/image/f8/ec/f8ecbeb887c4a1311f4f0bf05928476c7b3f632d15bb2b24e782baf2ba6f0d71.avif"},"tags":[]},"posts":[{"id":16855,"postNumber":1,"raw":"大二，不是西交学生，想补一补数据结构兼带练一练 java。最近在看 21sp 的 lab2，天资愚钝，一个人学习有点痛苦，有点交流可能会好得多，哪怕聊聊天也是好的 :smiling_face_with_tear:","cooked":"

大二，不是西交学生，想补一补数据结构兼带练一练 java。最近在看 21sp 的 lab2，天资愚钝，一个人学习有点痛苦，有点交流可能会好得多，哪怕聊聊天也是好的 🥲

\n","createdAt":"2023-11-13 05:32:31.136531","updatedAt":"2023-11-13 05:56:27.326958","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":67,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":2,"publicVersion":2,"deletedAt":null,"isAnonymous":false,"user":{"id":1628,"username":"Lorange","name":"主治医师李大华","avatarUrl":"/uploads/image/f8/ec/f8ecbeb887c4a1311f4f0bf05928476c7b3f632d15bb2b24e782baf2ba6f0d71.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16858,"postNumber":2,"raw":"是 mm 还是 gg？","cooked":"

是 mm 还是 gg？

\n","createdAt":"2023-11-13 05:43:56.311608","updatedAt":"2023-11-13 05:43:56.311608","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":5,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1047,"username":"anonymous_coward_old","name":"Anonymous Coward Old","avatarUrl":"/uploads/image/43/32/4332638c11248b8ff07033c11de0759a55205facfbec85e14458245a91991faf.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16859,"postNumber":3,"raw":"我正在学，目前到 21. Trees, BSTs","cooked":"

我正在学，目前到 21. Trees, BSTs

\n","createdAt":"2023-11-13 05:43:58.031567","updatedAt":"2023-11-13 05:43:58.031567","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":11,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":31,"username":"TsuinoSora","name":null,"avatarUrl":"/uploads/image/77/06/7706643ba6d3ee1ec9d0070db0ad8a22bed8651fa8eb829cf44df4d20fa24b3b.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16861,"postNumber":4,"raw":"好好好，如果🐭🐭这周能学完 Java\n那下周就狠狠追更这里😋\n在这里狠狠问大佬们问题🤗","cooked":"

好好好，如果🐭🐭这周能学完 Java
\n那下周就狠狠追更这里😋
\n在这里狠狠问大佬们问题🤗

\n","createdAt":"2023-11-13 05:48:38.271711","updatedAt":"2023-11-13 05:49:27.388602","replyToPostNumber":null,"replyCount":1,"likeCount":0,"wordCount":36,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":30,"username":"一只玉米人","name":"玉米🌽","avatarUrl":"/uploads/blob/14/96/14961aeaa46ccbb75a61eec0c27b26e74fb5d1c00ccdcbbe898ca9ea37087dd6.svg","admin":false,"moderator":true,"signatureRaw":"*年月擦身过，暂且问，会更好吗？*","signatureCooked":"

年月擦身过，暂且问，会更好吗？

\n"}},{"id":16873,"postNumber":5,"raw":"在想要不要把 sjtu 刷课群推广到 xjtu\n但交大门是开放论坛这一点让我有些犹豫","cooked":"

在想要不要把 sjtu 刷课群推广到 xjtu
\n但交大门是开放论坛这一点让我有些犹豫

\n","createdAt":"2023-11-13 07:54:14.110375","updatedAt":"2023-11-13 07:55:04.30755","replyToPostNumber":null,"replyCount":1,"likeCount":1,"wordCount":32,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":3235,"username":"东风始未已","name":null}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1834,"username":"Ayanami","name":"东川路第二小绫波","avatarUrl":"/uploads/image/4e/ae/4eae68ddf3343937ba6cd33e028ad09faf9f6222b71305557b731ca0658700c9.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16875,"postNumber":6,"raw":"sjtu 还有这种东西\nxjtu 就从来没听说过\n\n----\n\n开放论坛确实是个问题，不过你可以小窗给我吗我也在学（可以小窗给在学习的門友）","cooked":"

sjtu 还有这种东西
\nxjtu 就从来没听说过

开放论坛确实是个问题，不过你可以小窗给我吗我也在学（可以小窗给在学习的門友）

\n","createdAt":"2023-11-13 08:03:01.817594","updatedAt":"2023-11-13 08:03:01.817594","replyToPostNumber":5,"replyCount":2,"likeCount":0,"wordCount":54,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":31,"username":"TsuinoSora","name":null,"avatarUrl":"/uploads/image/77/06/7706643ba6d3ee1ec9d0070db0ad8a22bed8651fa8eb829cf44df4d20fa24b3b.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16876,"postNumber":7,"raw":"我有一个打卡贴：\n\nhttps://xjtu.app/t/topic/5645/52\n\n但是不太喜欢网课，主要是看书学，再配上做一些题目。会做一些 CS61b 的 hw 和 proj。然后我和 @TsuinoSora 看的都是 Spring 2018 学期。","cooked":"

我有一个打卡贴：

\n $\"uika_winwing\"$ \n uika_winwing — #52 in 【记录】这是什么？算法（第 4 版）？速通一下\n

Nov 10, 2023, 3:02:00 AM (Asia/Shanghai)

你已经掌握了排序算法的奥秘了，那么就来一场试炼罢。

LeetCode 148. Sort List

1 Selection sort

创建一个 sentinel node，每次选出最大的 node，append 到 sentinel 后面。

class Solution {\n\n    public ListNode sortList(ListNode head) {\n        return selectionSort(head);\n    }\n\n    private static ListNode selectionSort(ListNode head) {\n        ListNode sentinel = new ListNode(0, null);\n        while (head != null) {\n            ListNode largestPrev = findLargestPrev(head);\n            ListNode largest = largestPrev.next;\n\n            if (largest == head) {\n                head = head.next;\n            }\n            largestPrev.next = largest.next;\n            largest.next = sentinel.next;\n            sentinel.next = largest;\n        }\n        return sentinel.next;\n    }\n\n    /** return the previous node of the largest node */\n    private static ListNode findLargestPrev(ListNode head) {\n        ListNode largestPrev = new ListNode(0, head);\n        ListNode currentPrev = largestPrev;\n        while (currentPrev.next != null) {\n            if (currentPrev.next.val > largestPrev.next.val) {\n                largestPrev = currentPrev;\n            }\n            currentPrev = currentPrev.next;\n        }\n        return largestPrev;\n    }\n}\n

时间复杂度 $O(N^{2})$ ，空间复杂度 $O(1)$ ，不出意外的 TLE。

2 Insertion sort

数组的 insertion sort 是从头开始遍历，如果比左边小就向左交换位置。对于 SLList，依然是创建一个 sentinel node，从 head 节点开始一个一个插入 sentinel 之后，若比后面节点大则向右交换。

class Solution {\n\n    public ListNode sortList(ListNode head) {\n        return insertionSort(head);\n    }\n\n    private static ListNode insertionSort(ListNode head) {\n        ListNode sentinel = new ListNode(0, null);\n        while (head != null) {\n            ListNode temp = head;\n            head = head.next;\n            temp.next = sentinel.next;\n            sentinel.next = temp;\n            swapHelper(sentinel);\n        }\n        return sentinel.next;\n    }\n\n    /** swap first node of sorted list rightwards while larger than right */\n    private static void swapHelper(ListNode sentinel) {\n        ListNode prev = sentinel;\n        ListNode newly = sentinel.next;\n\n        while (newly.next != null && newly.val > newly.next.val) {\n            prev.next = newly.next;\n            newly.next = newly.next.next;\n            prev.next.next = newly;\n\n            prev = prev.next;\n        }\n    }\n}\n

时间复杂度 $O(N^{2})$ ，空间复杂度 $O(1)$ ，又是令人欣慰的 TLE。但是这个指针操作比上一个要优雅多了。

3 Mergesort

Divide and conquer. Use top-down mergesort.

class Solution {\n\n    public ListNode sortList(ListNode head) {\n        if (head == null) return null;\n        return mergesort(head);\n    }\n\n    /** recursively split and merge */\n    private static ListNode mergesort(ListNode head) {\n        if (head.next == null) return head;\n        ListNode mid = split(head);\n        ListNode leftSorted = mergesort(head);\n        ListNode rightSorted = mergesort(mid);\n        return merge(leftSorted, rightSorted);\n    }\n\n    /** split the given list into two and return the pointer to the second half */\n    private static ListNode split(ListNode head) {\n        ListNode fast = head.next;\n        ListNode slow = head;\n        while (fast != null && fast.next != null) {\n            fast = fast.next.next;\n            slow = slow.next;\n        }\n\n        ListNode mid = slow.next;\n        slow.next = null;\n        return mid;\n    }\n\n    /** merge left list and right list */\n    private static ListNode merge(ListNode left, ListNode right) {\n        ListNode sentinel = new ListNode(0, null);\n        ListNode rear = sentinel;\n        while (left != null && right != null) {\n            if (left.val <= right.val) {\n                ListNode temp = left;\n                left = left.next;\n                temp.next = null;\n                rear.next = temp;\n            } else {\n                ListNode temp = right;\n                right = right.next;\n                temp.next = null;\n                rear.next = temp;\n            }\n            rear = rear.next;\n        }\n\n        if (left == null) {\n            while (right != null) {\n                ListNode temp = right;\n                right = right.next;\n                temp.next = null;\n                rear.next = temp;\n                rear = rear.next;\n            }\n        } else { // right == null\n            while (left != null) {\n                ListNode temp = left;\n                left = left.next;\n                temp.next = null;\n                rear.next = temp;\n                rear = rear.next;\n            }\n        }\n\n        return sentinel.next;\n    }\n}\n

时间复杂度 $O(NlogN)$ ，空间复杂度 $O(1)$ ，顺利 AC。

对 SLList 进行 quicksort 用 Java 太难实现了，遂放弃。（因为 Java 方法只能返回一个值，并且不能像 C/C++ 一样传递指针的指针来实现多返回值。）

SLList 的节点只有一个指针空间，故也不能实现 Heapsort。所以 mergesort 事坠吼的。

但是有一点小问题：为了避免 mergesort 的 worst case，在数组版本中首先对待排序数组进行 shuffle，链表好像不是很好进行 shuffle。第二个就是为了方便在 SLList 中进行节点插入删除，我使用了 currentPrev.next == current。但感觉这样很不优雅，不知道有没有什么修改方法。

Insertion sort 中我函数抽象的层次不对，应该把可复用的 swap() 抽象出来，而不是依赖于调用函数的 swapHelper()。

但是不太喜欢网课，主要是看书学，再配上做一些题目。会做一些 CS61b 的 hw 和 proj。然后我和 @TsuinoSora 看的都是 Spring 2018 学期。

\n","createdAt":"2023-11-13 08:03:36.692631","updatedAt":"2024-10-25 11:18:48.910358","replyToPostNumber":null,"replyCount":1,"likeCount":0,"wordCount":57,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":6205,"username":"uika_winwing","name":null,"avatarUrl":"/uploads/image/76/3b/763b1e5ad8a424c4450bb26cea5ae532e7b1cd9da926ac5d99215d7123bf6002.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16878,"postNumber":8,"raw":"学“完”是不可能了，但是学得够用几天就行。今天看了一天 C# 语法特性，快要接近疯狂了 😫。","cooked":"

学“完”是不可能了，但是学得够用几天就行。今天看了一天 C# 语法特性，快要接近疯狂了 😫。

\n","createdAt":"2023-11-13 08:07:10.57995","updatedAt":"2024-10-25 11:18:49.264004","replyToPostNumber":4,"replyCount":0,"likeCount":0,"wordCount":41,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":6205,"username":"uika_winwing","name":null,"avatarUrl":"/uploads/image/76/3b/763b1e5ad8a424c4450bb26cea5ae532e7b1cd9da926ac5d99215d7123bf6002.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16880,"postNumber":9,"raw":"全部学透感觉有点难了，鱼鱼的 DS 和 Algorithm 都是跟着泥交的课刷 leetcode 学的，所以 61a 结束之后现在正在 61c 里艰难爬行（x","cooked":"

全部学透感觉有点难了，鱼鱼的 DS 和 Algorithm 都是跟着泥交的课刷 leetcode 学的，所以 61a 结束之后现在正在 61c 里艰难爬行（x

\n","createdAt":"2023-11-13 08:15:02.506537","updatedAt":"2023-11-13 08:15:18.816215","replyToPostNumber":null,"replyCount":1,"likeCount":1,"wordCount":48,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":3235,"username":"东风始未已","name":null}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1740,"username":"Risc_lt","name":null,"avatarUrl":"/uploads/image/d0/4f/d04f11d0f502f1c2af7d7e6d4ff16e28d81d3455f60873309ff4fd9f58deb117.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16883,"postNumber":10,"raw":"支持😤","cooked":"

支持😤

\n","createdAt":"2023-11-13 08:19:23.021233","updatedAt":"2023-11-13 08:19:23.021233","replyToPostNumber":6,"replyCount":0,"likeCount":1,"wordCount":3,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":1834,"username":"Ayanami","name":"东川路第二小绫波"}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1628,"username":"Lorange","name":"主治医师李大华","avatarUrl":"/uploads/image/f8/ec/f8ecbeb887c4a1311f4f0bf05928476c7b3f632d15bb2b24e782baf2ba6f0d71.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16890,"postNumber":11,"raw":"已经私戳你了\n也不是什么成熟的群，现在挺冷的，好多大一小朋友并不知道怎么刷课。\n作为群主感觉有点失败，所以要引入外部力量早日帮群 u 们破除内卷观念 :kissing:\n顺带捞一个刷 pa 和 081 的搭子","cooked":"

已经私戳你了
\n也不是什么成熟的群，现在挺冷的，好多大一小朋友并不知道怎么刷课。
\n作为群主感觉有点失败，所以要引入外部力量早日帮群 u 们破除内卷观念 😗
\n顺带捞一个刷 pa 和 081 的搭子

\n","createdAt":"2023-11-13 09:56:44.24966","updatedAt":"2023-11-13 09:59:27.942918","replyToPostNumber":6,"replyCount":5,"likeCount":2,"wordCount":83,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":2,"users":[{"id":1835,"username":"Dusk","name":"夕大画家"},{"id":3235,"username":"东风始未已","name":null}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1834,"username":"Ayanami","name":"东川路第二小绫波","avatarUrl":"/uploads/image/4e/ae/4eae68ddf3343937ba6cd33e028ad09faf9f6222b71305557b731ca0658700c9.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16893,"postNumber":12,"raw":"戳戳我好吗 🥺","cooked":"

戳戳我好吗 🥺

\n","createdAt":"2023-11-13 10:32:45.68055","updatedAt":"2024-10-25 11:18:49.581459","replyToPostNumber":11,"replyCount":0,"likeCount":1,"wordCount":6,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":1834,"username":"Ayanami","name":"东川路第二小绫波"}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":6205,"username":"uika_winwing","name":null,"avatarUrl":"/uploads/image/76/3b/763b1e5ad8a424c4450bb26cea5ae532e7b1cd9da926ac5d99215d7123bf6002.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16894,"postNumber":13,"raw":"求戳 :smiling_face_with_3_hearts:","cooked":"

求戳 🥰

\n","createdAt":"2023-11-13 10:37:05.347678","updatedAt":"2023-11-13 10:37:05.347678","replyToPostNumber":11,"replyCount":0,"likeCount":1,"wordCount":3,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":1834,"username":"Ayanami","name":"东川路第二小绫波"}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":601,"username":"m0rsun","name":null,"avatarUrl":"/uploads/image/37/7f/377f4ae853850691ab959270f01d52509ee07caf808041ddb0ab22488a0e9f85.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16902,"postNumber":14,"raw":"学 61c 要写 c 和 asm 了，然而泥交的程序设计基础和数据结构全是用 c 教的，已经品尝够多了 :sob_mouse:","cooked":"

学 61c 要写 c 和 asm 了，然而泥交的程序设计基础和数据结构全是用 c 教的，已经品尝够多了 $\":sob_mouse:\"$

\n","createdAt":"2023-11-13 10:49:34.482837","updatedAt":"2024-10-25 11:18:49.818464","replyToPostNumber":9,"replyCount":0,"likeCount":1,"wordCount":40,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":1834,"username":"Ayanami","name":"东川路第二小绫波"}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":6205,"username":"uika_winwing","name":null,"avatarUrl":"/uploads/image/76/3b/763b1e5ad8a424c4450bb26cea5ae532e7b1cd9da926ac5d99215d7123bf6002.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16908,"postNumber":15,"raw":"c 不行，学 c 不如学 go，学 c++ 不如学 rust","cooked":"

c 不行，学 c 不如学 go，学 c++ 不如学 rust

\n","createdAt":"2023-11-13 10:57:58.660266","updatedAt":"2023-11-13 10:57:58.660266","replyToPostNumber":null,"replyCount":0,"likeCount":0,"wordCount":16,"liked":false,"bookmarked":false,"polls":[],"reactions":[],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1047,"username":"anonymous_coward_old","name":"Anonymous Coward Old","avatarUrl":"/uploads/image/43/32/4332638c11248b8ff07033c11de0759a55205facfbec85e14458245a91991faf.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16913,"postNumber":16,"raw":"求戳😘","cooked":"

求戳😘

\n","createdAt":"2023-11-13 11:25:02.834815","updatedAt":"2023-11-13 11:25:02.834815","replyToPostNumber":11,"replyCount":0,"likeCount":1,"wordCount":3,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":1834,"username":"Ayanami","name":"东川路第二小绫波"}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1012,"username":"Ratled","name":"精神zjuer","avatarUrl":"/uploads/image/89/ef/89ef07eb555027991fb26d221d8c82a190263dadfbc37bf3168f21f00fe77884.avif","admin":false,"moderator":false,"signatureRaw":null,"signatureCooked":null}},{"id":16937,"postNumber":18,"raw":"呜，什么时候能看到有同学一起刷 GAMES 课啊 :loudly_crying_face:","cooked":"

呜，什么时候能看到有同学一起刷 GAMES 课啊 😭

\n","createdAt":"2023-11-13 13:08:25.18828","updatedAt":"2023-11-13 13:08:25.18828","replyToPostNumber":null,"replyCount":1,"likeCount":1,"wordCount":19,"liked":false,"bookmarked":false,"polls":[],"reactions":[{"reaction":"❤️","count":1,"users":[{"id":1834,"username":"Ayanami","name":"东川路第二小绫波"}],"hasReacted":false}],"wiki":false,"version":1,"publicVersion":1,"deletedAt":null,"isAnonymous":false,"user":{"id":1381,"username":"greyishsong","name":"greyishsong","avatarUrl":"/uploads/image/da/bc/dabc731b0311f59850625bbeb55ed969fcfac0430c5ef0f68441e5466b7aa496.avif","admin":false,"moderator":true,"signatureRaw":null,"signatureCooked":null}},{"id":16989,"postNumber":20,"raw":"戳戳🐭🐭","cooked":"

戳戳🐭🐭

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hxd 用的是哪本书 👁️对我个人来说，看书之后立刻上手确实比网课效率高一点 🤗

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书就是贴子标题那本啰，在有一楼还发了几张内容的照片

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