04 2021 档案
摘要：Powerful Integers (M) 题目 Given three integers x, y, and bound, return a list of all the powerful integers that have a value less than or equal to boun
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摘要：Power of Three (E) 题目 Given an integer n, return true if it is a power of three. Otherwise, return false. An integer n is a power of three, if there e
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摘要：Furthest Building You Can Reach (M) 题目 You are given an integer array heights representing the heights of buildings, some bricks, and some ladders. Yo
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摘要：Critical Connections in a Network (H) 题目 There are n servers numbered from 0 to n-1 connected by undirected server-to-server connections forming a net
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摘要：Count Binary Substrings (E) 题目 Give a string s, count the number of non-empty (contiguous) substrings that have the same number of 0's and 1's, and al
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摘要：Brick Wall (M) 题目 There is a brick wall in front of you. The wall is rectangular and has several rows of bricks. The bricks have the same height but d
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摘要：Triangle (M) 题目 Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For examp
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摘要：N-ary Tree Preorder Traversal (E) 题目 Given the root of an n-ary tree, return the preorder traversal of its nodes' values. Nary-Tree input serializatio
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摘要：Combination Sum IV (M) 题目 Given an array of distinct integers nums and a target integer target, return the number of possible combinations that add up
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摘要：Number of Submatrices That Sum to Target (H) 题目 Given a matrix and a target, return the number of non-empty submatrices that sum to target. A submatri
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摘要：Remove All Adjacent Duplicates in String II (M) 题目 Given a string s, a k duplicate removal consists of choosing k adjacent and equal letters from s an
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摘要：Fibonacci Number (E) 题目 The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum
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摘要：Partition List (M) 题目 Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. Yo
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摘要：Beautiful Arrangement II (M) 题目 Given two integers n and k, you need to construct a list which contains n different positive integers ranging from 1 t
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摘要：Deepest Leaves Sum (M) 题目 Given the root of a binary tree, return the sum of values of its deepest leaves. Example 1: Input: root = [1,2,3,4,5,null,6,
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摘要：Longest Increasing Path in a Matrix (H) 题目 Given an m x n integers matrix, return the length of the longest increasing path in matrix. From each cell,
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摘要：Verifying an Alien Dictionary (E) 题目 In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. Th
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摘要：Determine if String Halves Are Alike (E) 题目 You are given a string s of even length. Split this string into two halves of equal lengths, and let a be
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摘要：Minimum Operations to Make Array Equal (M) 题目 You have an array arr of length n where arr[i] = (2 * i) + 1 for all valid values of i (i.e. 0 <= i < n)
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摘要：Global and Local Inversions (M) 题目 We have some permutation A of [0, 1, ..., N - 1], where N is the length of A. The number of (global) inversions is
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摘要：Design Circular Queue (M) 题目 Design your implementation of the circular queue. The circular queue is a linear data structure in which the operations a
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摘要：Ones and Zeroes (M) 题目 You are given an array of binary strings strs and two integers m and n. Return the size of the largest subset of strs such that
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摘要：Palindrome Linked List (E) 题目 Given a singly linked list, determine if it is a palindrome. Example 1: Input: 1->2 Output: false Example 2: Input: 1->2
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