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题目描述 Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farth 阅读全文
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题目描述 Given n points on a 2D plane, find the maximum number of points that lie on the same straight line. 思路：注意垂直和重叠的点 代码 时间341ms 空间19988k /** * Defini 阅读全文
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题目描述 Sort a linked list in O(n log n) time using constant space complexity. 思路：时间复杂度为O(nlogn)，空间复杂度为常数，用归并排序 在下的代码 时间1162ms 空间27696k /** * Definition 阅读全文