随笔分类 - leetcode
https://leetcode.com/problemset/all/
摘要：A cinema has n rows of seats, numbered from 1 to n and there are ten seats in each row, labelled from 1 to 10 as shown in the figure above. Given the
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摘要：Given the root of a binary tree, return the sum of all left leaves. A leaf is a node with no children. A left leaf is a leaf that is the left child of
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摘要：「句子」是一个用空格分隔单词的字符串。给你一个满足下述格式的句子 text : 句子的首字母大写 text 中的每个单词都用单个空格分隔。 请你重新排列 text 中的单词，使所有单词按其长度的升序排列。如果两个单词的长度相同，则保留其在原句子中的相对顺序。 请同样按上述格式返回新的句子。 示例 1
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摘要：给你二叉树的根节点 root ，返回它节点值的 前序 遍历。 示例 1： 输入：root = [1,null,2,3] 输出：[1,2,3] 示例 2： 输入：root = [] 输出：[] 示例 3： 输入：root = [1] 输出：[1] 示例 4： 输入：root = [1,2] 输出：[1
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摘要：You are given a sorted unique integer array nums. Return the smallest sorted list of ranges that cover all the numbers in the array exactly. That is,
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摘要：Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area. Example: Input: 1 0 1 0 0 1 0 1 1 1
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摘要：A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy
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摘要：You are standing at position 0 on an infinite number line. There is a goal at position target. On each move, you can either go left or right. During t
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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 query should return 200 a
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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：Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. For example, aft
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摘要：Given a text file file.txt that contains list of phone numbers (one per line), write a one liner bash script to print all valid phone numbers. You may
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摘要：Given two strings A and B, find the minimum number of times A has to be repeated such that B is a substring of it. If no such solution, return 1. For
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摘要：Sort a linked list in O(n log n) time using constant space complexity. Example 1: Input: 4 2 1 3 Output: 1 2 3 4 Example 2: Input: 1 5 3 4 0 Output: 1
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摘要：Sort a linked list using insertion sort. A graphical example of insertion sort. The partial sorted list (black) initially contains only the first elem
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摘要：Winter is coming! Your first job during the contest is to design a standard heater with fixed warm radius to warm all the houses. Now, you are given p
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摘要：Given two strings A and B of lowercase letters, return true if and only if we can swap two letters in A so that the result equals B. Example 1: Exampl
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摘要：A game on an undirected graph is played by two players, Mouse and Cat, who alternate turns. The graph is given as follows: graph[a] is a list of all n
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摘要：Given an array of characters, compress it in place. The length after compression must always be smaller than or equal to the original array. Every ele
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摘要：Given scores of N athletes, find their relative ranks and the people with the top three highest scores, who will be awarded medals: "Gold Medal", "Sil
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