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Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adja 阅读全文
posted @ 2020-04-16 10:18
xuan_abc
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Design a HashMap without using any built-in hash table libraries. To be specific, your design should include these functions: put(key, value) : Insert 阅读全文
posted @ 2020-04-15 21:32
xuan_abc
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Given a binary tree, return the values of its boundary in anti-clockwise direction starting from root. Boundary includes left boundary, leaves, and ri 阅读全文
posted @ 2020-04-15 20:30
xuan_abc
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There are 8 prison cells in a row, and each cell is either occupied or vacant. Each day, whether the cell is occupied or vacant changes according to t 阅读全文
posted @ 2020-04-15 04:33
xuan_abc
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Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) Yo 阅读全文
posted @ 2020-04-14 21:49
xuan_abc
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Given an array nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k num 阅读全文
posted @ 2020-04-14 21:07
xuan_abc
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Given a list of words (without duplicates), please write a program that returns all concatenated words in the given list of words. A concatenated word 阅读全文
posted @ 2020-04-14 07:52
xuan_abc
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Design an in-memory file system to simulate the following functions: ls: Given a path in string format. If it is a file path, return a list that only 阅读全文
posted @ 2020-04-14 04:29
xuan_abc
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We have a list of points on the plane. Find the K closest points to the origin (0, 0). (Here, the distance between two points on a plane is the Euclid 阅读全文
posted @ 2020-04-06 06:44
xuan_abc
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Given n ropes of different lengths, we need to connect these ropes into one rope. We can connect only 2 ropes at a time. The cost required to connect 阅读全文
posted @ 2020-04-06 04:24
xuan_abc
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