随笔分类 - LeetCode
摘要：Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be integ
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摘要：The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id. Given the Em
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摘要：Write a SQL query to find all numbers that appear at least three times consecutively. For example, given the above Logs table, 1 is the only number th
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摘要：Write a SQL query to rank scores. If there is a tie between two scores, both should have the same ranking. Note that after a tie, the next ranking num
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摘要：Given a string, find the length of the longest substring T that contains at most k distinct characters. Example 1: Input: s = "eceba", k = 2 Output: 3
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摘要：Write a SQL query to get the nth highest salary from the Employee table. For example, given the above Employee table, the nth highest salary where n =
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摘要：Write a SQL query to get the second highest salary from the Employee table. For example, given the above Employee table, the second highest salary is
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摘要：Table: Person Table: Address Write a SQL query for a report that provides the following information for each person in the Person table, regardless if
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摘要：Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list -- w
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摘要：Given an array nums and a target value k, find the maximum length of a subarray that sums to k. If there isn't one, return 0 instead. Note:The sum of
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摘要：Numbers can be regarded as product of its factors. For example, 8 = 2 x 2 x 2; = 2 x 4. Write a function that takes an integer n and return all possib
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摘要：Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree. You may assume each number in the seq
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摘要：Given a pattern and a string str, find if strfollows the same pattern. Here follow means a full match, such that there is a bijection between a letter
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摘要：There are a row of n houses, each house can be painted with one of the k colors. The cost of painting each house with a certain color is different. Yo
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摘要：There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a certai
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摘要：Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form
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摘要：Suppose you are at a party with n people (labeled from 0 to n - 1) and among them, there may exist one celebrity. The definition of a celebrity is tha
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摘要：Given a binary search tree and a node in it, find the in-order successor of that node in the BST. The successor of a node p is the node with the small
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摘要：Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row2
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摘要：You want to build a house on an empty land which reaches all buildings in the shortest amount of distance. You can only move up, down, left and right.
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