随笔分类 - 算法题
摘要：Given a matrix of M x N elements (M rows, N columns), return all elements of the matrix in diagonal order as shown in the below image. Example: Note:
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摘要：Given a circular array (the next element of the last element is the first element of the array), print the Next Greater Number for every element. The
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摘要：You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all the next greater numbers for nums1'
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摘要：Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence. For example, in the given t
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摘要：Given an integer n, return 1 - n in lexicographical order. For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9]. Please optimize your algori
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摘要：On a horizontal number line, we have gas stations at positions stations[0], stations[1], ..., stations[N-1], where N = stations.length. Now, we add K
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摘要：Given a Binary Search Tree (BST) with root node root, and a target value V, split the tree into two subtrees where one subtree has nodes that are all
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摘要：You are given a data structure of employee information, which includes the employee's unique id, his importance value and his directsubordinates' id.
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摘要：A self-dividing number is a number that is divisible by every digit it contains. For example, 128 is a self-dividing number because 128 % 1 == 0, 128
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摘要：Given a string and an integer k, you need to reverse the first k characters for every 2k characters counting from the start of the string. If there ar
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摘要：You are given a string representing an attendance record for a student. The record only contains the following three characters: A student could be re
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摘要：The Employee table holds all employees. Every employee has an Id, and there is also a column for the department Id. The Department table holds all dep
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摘要：X city built a new stadium, each day many people visit it and the stats are saved as these columns: id, date, people Please write a query to display t
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摘要：Mary is a teacher in a middle school and she has a table seat storing students' names and their corresponding seat ids. The column id is continuous in
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摘要：There is a table courses with columns: student and class Please list out all classes which have more than or equal to 5 students. For example, the tab
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摘要：X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and descrip
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摘要：Given a table salary, such as the one below, that has m=male and f=female values. Swap all f and m values (i.e., change all f values to m and vice ver
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摘要：You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contai
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摘要：You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contai
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摘要：Given an m * n matrix M initialized with all 0's and several update operations. Operations are represented by a 2D array, and each operation is repres
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