随笔分类 -  Level 2

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1650. Lowest Common Ancestor of a Binary Tree III
摘要：Description Given two nodes of a binary tree p and q, return their lowest common ancestor (LCA). Each node will have a reference to its parent node. T 阅读全文
posted @ 2024-12-28 06:07 北叶青藤 阅读(19) 评论(0) 推荐(0)
1631. Path With Minimum Effort
摘要：You are a hiker preparing for an upcoming hike. You are given heights, a 2D array of size rows x columns, where heights[row][col] represents the heigh 阅读全文
posted @ 2021-07-05 07:23 北叶青藤 阅读(56) 评论(0) 推荐(0)
Find all paths with min weights in an undirected graph
摘要：You are given a list of edges in a graph with weight. Find all the paths between start node and end node with min weights in the path. The edges like 阅读全文
posted @ 2021-06-25 01:58 北叶青藤 阅读(52) 评论(0) 推荐(0)
1472. Design Browser History
摘要：You have a browser of one tab where you start on the homepage and you can visit another url, get back in the history number of steps or move forward i 阅读全文
posted @ 2021-06-21 09:44 北叶青藤 阅读(37) 评论(0) 推荐(0)
1152. Analyze User Website Visit Pattern
摘要：We are given some website visits: the user with name username[i] visited the website website[i] at time timestamp[i]. A 3-sequence is a list of websit 阅读全文
posted @ 2021-06-21 07:40 北叶青藤 阅读(70) 评论(0) 推荐(0)
1381. Design a Stack With Increment Operation
摘要：Design a stack which supports the following operations. Implement the CustomStack class: CustomStack(int maxSize) Initializes the object with maxSize  阅读全文
posted @ 2021-04-27 23:00 北叶青藤 阅读(110) 评论(0) 推荐(0)
427. Construct Quad Tree
摘要：Given a n * n matrix grid of 0's and 1's only. We want to represent the grid with a Quad-Tree. Return the root of the Quad-Tree representing the grid. 阅读全文
posted @ 2021-04-09 22:32 北叶青藤 阅读(60) 评论(0) 推荐(0)
1626. Best Team With No Conflicts
摘要：You are the manager of a basketball team. For the upcoming tournament, you want to choose the team with the highest overall score. The score of the te 阅读全文
posted @ 2021-04-09 21:38 北叶青藤 阅读(89) 评论(0) 推荐(0)
1254. Number of Closed Islands
摘要：Given a 2D grid consists of 0s (land) and 1s (water). An island is a maximal 4-directionally connected group of 0s and a closed island is an island to 阅读全文
posted @ 2021-04-09 10:48 北叶青藤 阅读(67) 评论(0) 推荐(0)
694. Number of Distinct Islands
摘要：Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) Yo 阅读全文
posted @ 2021-04-08 09:12 北叶青藤 阅读(51) 评论(0) 推荐(0)
1522. Diameter of N-Ary Tree
摘要：Given a root of an N-ary tree, you need to compute the length of the diameter of the tree. The diameter of an N-ary tree is the length of the longest  阅读全文
posted @ 2021-04-08 08:34 北叶青藤 阅读(48) 评论(0) 推荐(0)
323. Number of Connected Components in an Undirected Graph
摘要：You have a graph of n nodes. You are given an integer n and an array edges where edges[i] = [ai, bi] indicates that there is an edge between ai and bi 阅读全文
posted @ 2021-04-08 08:17 北叶青藤 阅读(173) 评论(0) 推荐(0)
759. Employee Free Time
摘要：We are given a list schedule of employees, which represents the working time for each employee. Each employee has a list of non-overlapping Intervals, 阅读全文
posted @ 2021-04-08 08:13 北叶青藤 阅读(62) 评论(0) 推荐(0)
752. Open the Lock
摘要：You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'. The wheels can rota 阅读全文
posted @ 2021-04-08 07:48 北叶青藤 阅读(83) 评论(0) 推荐(0)
791. Custom Sort String
摘要：S and T are strings composed of lowercase letters. In S, no letter occurs more than once. S was sorted in some custom order previously. We want to per 阅读全文
posted @ 2021-04-08 02:53 北叶青藤 阅读(46) 评论(0) 推荐(0)
787. Cheapest Flights Within K Stops
摘要：There are n cities connected by m flights. Each flight starts from city u and arrives at v with a price w. Now given all the cities and flights, toget 阅读全文
posted @ 2021-04-05 07:05 北叶青藤 阅读(58) 评论(0) 推荐(0)
1382. Balance a Binary Search Tree
摘要：Given a binary search tree, return a balanced binary search tree with the same node values. A binary search tree is balanced if and only if the depth 阅读全文
posted @ 2021-03-29 05:43 北叶青藤 阅读(48) 评论(0) 推荐(0)
1060. Missing Element in Sorted Array
摘要：Given an integer array nums which is sorted in ascending order and all of its elements are unique and given also an integer k, return the kth missing 阅读全文
posted @ 2021-03-29 02:33 北叶青藤 阅读(59) 评论(0) 推荐(0)
536. Construct Binary Tree from String
摘要：You need to construct a binary tree from a string consisting of parenthesis and integers. The whole input represents a binary tree. It contains an int 阅读全文
posted @ 2021-03-29 01:11 北叶青藤 阅读(35) 评论(0) 推荐(0)
958. Check Completeness of a Binary Tree
摘要：Given the root of a binary tree, determine if it is a complete binary tree. In a complete binary tree, every level, except possibly the last, is compl 阅读全文
posted @ 2021-03-29 01:08 北叶青藤 阅读(80) 评论(0) 推荐(0)

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