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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 @ 2019-07-15 02:03
北叶青藤
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Given N, consider a convex N-sided polygon with vertices labelled A[0], A[i], ..., A[N-1] in clockwise order. Suppose you triangulate the polygon into 阅读全文
posted @ 2019-07-09 09:33
北叶青藤
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You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be rep 阅读全文
posted @ 2019-07-08 06:32
北叶青藤
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In English, we have a concept called root, which can be followed by some other words to form another longer word - let's call this word successor. For 阅读全文
posted @ 2019-07-08 05:36
北叶青藤
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In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as 阅读全文
posted @ 2019-07-08 05:10
北叶青藤
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Given an array of integers A with even length, return true if and only if it is possible to reorder it such that A[2 * i + 1] = 2 * A[2 * i] for every 阅读全文
posted @ 2019-07-08 01:47
北叶青藤
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Whenever you expose a web service / api endpoint, you need to implement a rate limiter to prevent abuse of the service (DOS attacks). Implement a Rate 阅读全文
posted @ 2019-07-08 00:33
北叶青藤
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Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in t 阅读全文
posted @ 2019-07-07 23:40
北叶青藤
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There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop roll 阅读全文
posted @ 2019-07-07 13:38
北叶青藤
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Solve a given equation and return the value of x in the form of string "x=#value". The equation contains only '+', '-' operation, the variable x and i 阅读全文
posted @ 2019-07-07 10:24
北叶青藤
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