随笔分类 - LeetCode
摘要：题目： Given a string containing only three types of characters: '(', ')' and '*', write a function to check whether this string is valid. We define the
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摘要：题目： 一个花园有N个位置。每个位置上有一朵花。这N朵花会在N天内逐一盛开。每天都一定会有并且只有一朵花盛开，从这天起，这朵花将一直处于盛开的状态。 给定一个由数字1到N组成的数组flowers。数组中的每个数字表示那一天将会盛开的花的位置。 例如，flowers[i] = x表示在位置x上的花会在
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摘要：题目： You are given a data structure of employee information, which includes the employee's unique id, his importance value and his direct subordinates'
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摘要：题目： In this problem, a tree is an undirected graph that is connected and has no cycles. The given input is a graph that started as a tree with N nodes
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摘要：题目： Implement a trie with insert, search, and startsWith methods. Example: Trie trie = new Trie(); trie.insert("apple"); trie.search("apple"); // retu
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摘要：题目： Given two words (beginWord and endWord), and a dictionary's word list, find all shortest transformation sequence(s) from beginWord to endWord, suc
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摘要：题目： Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWo
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摘要：题目： 给定一个"HH:MM"格式的时间，重复使用这些数字，返回下一个最近的时间。每个数字可以被重复使用任意次。 保证输入的时间都是有效的。例如，"01:34"，"12:09" 都是有效的，而"1:34"，"12:9"都不是有效的时间。 样例 样例 1: 输入: "19:34" 输出: "19:39
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摘要：题目： You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types: Integer (one round's score):
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摘要：题目： A city's skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. Now suppose you are
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摘要：题目： https://leetcode.com/problems/friend-circles/ There are N students in a class. Some of them are friends, while some are not. Their friendship is t
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摘要：题目： There is a strange printer with the following two special requirements: The printer can only print a sequence of the same character each time. At
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摘要：题目： Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adj
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摘要：题目： Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters.
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摘要：题目： 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 (
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摘要：题目： 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
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摘要：题目： Implement a MapSum class with insert, and sum methods. For the method insert, you'll be given a pair of (string, integer). The string represents t
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摘要：题目： Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome. Example 1: Input: "aba" Output: True
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摘要：题目： Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer,
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LeetCode 381. Insert Delete GetRandom O(1) - Duplicates allowed O(1) 时间插入、删除和获取随机元素 - 允许重复(C++/Java)
摘要：题目： Design a data structure that supports all following operations in averageO(1) time. Note: Duplicate elements are allowed. insert(val): Inserts an
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