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完整开放第一个 family：遍历与连通性，并开放 LC 1–100 及所有与该 family 相关的候选解法路线。

1open family
100LC 1–100 routes
541Free problem pages

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首个 family

4 个模板、invariant、代码骨架与相关题。

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LC 1–100

按题号、title、tags 与 template 搜索候选路线。

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全部 Free 题

LC 1–100 与首个 family 相关题的并集，共 541 题。

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完整 Pro 库

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Pattern families

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遍历与连通性

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有序前沿与路径

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二分与单调答案

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双指针与滑动窗口

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前缀、差分与哈希状态

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栈、单调栈与单调队列

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堆、选择与流

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贪心与调度

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分治与归并计数

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动态规划

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回溯与约束搜索

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树、BST 与 Trie

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并查集、MST 与离线激活

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区间查询数据结构

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字符串匹配、哈希与回文

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数学、数论与组合

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位运算与位掩码状态

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几何、扫描线、模拟与解析

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