11 2020 档案
摘要：Jump Game III (M) 题目 Given an array of non-negative integers arr, you are initially positioned at start index of the array. When you are at index i, y
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摘要：Sliding Window Maximum (H) 题目 You are given an array of integers nums, there is a sliding window of size k which is moving from the very left of the a
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摘要：Partition Equal Subset Sum (M) 题目 Given a non-empty array nums containing only positive integers, find if the array can be partitioned into two subset
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摘要：Longest Substring with At Least K Repeating Characters (M) 题目 Given a string s and an integer k, return the length of the longest substring of s such
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摘要：Smallest Integer Divisible by K (M) 题目 Given a positive integer K, you need to find the length of the smallest positive integer N such that N is divis
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摘要：Basic Calculator II (M) 题目 Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integ
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摘要：House Robber III (M) 题目 The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the "root." Be
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摘要：Unique Morse Code Words (E) 题目 International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as fol
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摘要：Numbers At Most N Given Digit Set (H) 题目 Given an array of digits, you can write numbers using each digits[i] as many times as we want. For example, i
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摘要：Search in Rotated Sorted Array II (M) 题目 Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., [0,0,1,
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摘要：Decode String (M) 题目 Given an encoded string, return its decoded string. The encoding rule is: k[encoded_string], where the encoded_string inside the
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摘要：Mirror Reflection (M) 题目 There is a special square room with mirrors on each of the four walls. Except for the southwest corner, there are receptors o
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摘要：Longest Mountain in Array (M) 题目 Let's call any (contiguous) subarray B (of A) a mountain if the following properties hold: B.length >= 3 There exists
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摘要：Range Sum of BST (E) 题目 Given the root node of a binary search tree, return the sum of values of all nodes with a value in the range [low, high]. Exam
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摘要：Poor Pigs (H) 题目 There are 1000 buckets, one and only one of them is poisonous, while the rest are filled with water. They all look identical. If a pi
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摘要：Populating Next Right Pointers in Each Node (M) 题目 You are given a perfect binary tree where all leaves are on the same level, and every parent has tw
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摘要：Valid Square (M) 题目 Given the coordinates of four points in 2D space, return whether the four points could construct a square. The coordinate (x,y) of
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摘要：Flipping an Image (E) 题目 Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image. To flip an i
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摘要：Maximum Difference Between Node and Ancestor (M) 题目 Given the root of a binary tree, find the maximum value V for which there exist different nodes A
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摘要：Binary Tree Tilt (E) 题目 Given the root of a binary tree, return the sum of every tree node's tilt. The tilt of a tree node is the absolute difference
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摘要：Add Two Numbers II (M) 题目 You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and
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摘要：Find the Smallest Divisor Given a Threshold (M) 题目 Given an array of integers nums and an integer threshold, we will choose a positive integer divisor
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摘要：Minimum Cost to Move Chips to The Same Position (E) 题目 We have n chips, where the position of the ith chip is position[i]. We need to move all the chi
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摘要：Minimum Height Trees (M) 题目 A tree is an undirected graph in which any two vertices are connected by exactly one path. In other words, any connected g
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摘要：Consecutive Characters (E) 题目 Given a string s, the power of the string is the maximum length of a non-empty substring that contains only one unique c
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摘要：Insertion Sort List (M) 题目 Sort a linked list using insertion sort. A graphical example of insertion sort. The partial sorted list (black) initially c
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摘要：Convert Binary Number in a Linked List to Integer (E) 题目 Given head which is a reference node to a singly-linked list. The value of each node in the l
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摘要：Recover Binary Search Tree (H) 题目 You are given the root of a binary search tree (BST), where exactly two nodes of the tree were swapped by mistake. R
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