随笔分类 - Leetcode
摘要：965. Univalued Binary Tree A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is univa
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摘要：We are given a 2-dimensional grid. "." is an empty cell, "#" is a wall, "@" is the starting point, ("a", "b", ...) are keys, and ("A", "B", ...) are l
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摘要：There are N workers. The i-th worker has a quality[i] and a minimum wage expectation wage[i]. Now we want to hire exactly K workers to form a paid gro
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摘要：Your car starts at position 0 and speed +1 on an infinite number line. (Your car can go into negative positions.) Your car drives automatically accord
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摘要：961. N-Repeated Element in Size 2N Array In a array A of size 2N, there are N+1 unique elements, and exactly one of these elements is repeated N times
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摘要：There are n cities connected by m flights. Each fight starts from city u and arrives at v with a price w. Now given all the cities and flights, togeth
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摘要：There are N network nodes, labelled 1 to N. Given times, a list of travel times as directed edges times[i] = (u, v, w), where u is the source node, v
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摘要：Given a non-empty list of words, return the k most frequent elements. Your answer should be sorted by frequency from highest to lowest. If two words h
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摘要：You are given an integer array sorted in ascending order (may contain duplicates), you need to split them into several subsequences, where each subseq
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摘要：Suppose LeetCode will start its IPO soon. In order to sell a good price of its shares to Venture Capital, LeetCode would like to work on some projects
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摘要：You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k. Define a pair (u,v) which consists of one element from th
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摘要：Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. Example
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摘要：Given an array nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k num
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摘要：Write a program to find the nth super ugly number. Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes
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摘要：Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two
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摘要：Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Example: Input: n = 10 Outpu
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摘要：Given a list of words (without duplicates), please write a program that returns all concatenated words in the given list of words. A concatenated word
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摘要：958. Check Completeness of a Binary Tree Given a binary tree, determine if it is a complete binary tree. Definition of a complete binary tree from Wik
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摘要：Given an m x n matrix of non-negative integers representing the height of each unit cell in a continent, the "Pacific ocean" touches the left and top
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摘要：There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to
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