02 2021 档案
摘要：Maximum Frequency Stack (H) 题目 Implement FreqStack, a class which simulates the operation of a stack-like data structure. FreqStack has two functions:
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摘要：Validate Stack Sequences (M) 题目 Given two sequences pushed and popped with distinct values, return true if and only if this could have been the result
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摘要：Shortest Unsorted Continuous Subarray (M) 题目 Given an integer array nums, you need to find one continuous subarray that if you only sort this subarray
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摘要：Score of Parentheses (M) 题目 Given a balanced parentheses string S, compute the score of the string based on the following rule: () has score 1 AB has
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摘要：Search a 2D Matrix II (M) 题目 Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Inte
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摘要：Longest Word in Dictionary through Deleting (M) 题目 Given a string and a string dictionary, find the longest string in the dictionary that can be forme
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摘要：Broken Calculator (M) 题目 On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number o
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摘要：Minimum Remove to Make Valid Parentheses (M) 题目 Given a string s of '(' , ')' and lowercase English characters. Your task is to remove the minimum num
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摘要：Arithmetic Slices (M) 题目 A sequence of numbers is called arithmetic if it consists of at least three elements and if the difference between any two co
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摘要：Letter Case Permutation (M) 题目 Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Ret
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摘要：The K Weakest Rows in a Matrix (E) 题目 Given a m * n matrix mat of ones (representing soldiers) and zeros (representing civilians), return the indexes
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摘要：Is Graph Bipartite? (M) 题目 Given an undirected graph, return true if and only if it is bipartite. Recall that a graph is bipartite if we can split its
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摘要：Shortest Path in Binary Matrix (M) 题目 In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-rig
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摘要：Number of Steps to Reduce a Number to Zero (E) 题目 Given a non-negative integer num, return the number of steps to reduce it to zero. If the current nu
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摘要：Valid Anagram (E) 题目 Given two strings s and t , write a function to determine if t is an anagram of s. Example 1: Input: s = "anagram", t = "nagaram"
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摘要：Copy List with Random Pointer (M) 题目 A linked list is given such that each node contains an additional random pointer which could point to any node in
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摘要：Convert BST to Greater Tree (M) 题目 Given the root of a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST
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摘要：Shortest Distance to a Character (E) 题目 Given a string s and a character c that occurs in s, return an array of integers answer where answer.length ==
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摘要：Binary Tree Right Side View (M) 题目 Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see
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摘要：Simplify Path (M) 题目 Given a string path, which is an absolute path (starting with a slash '/') to a file or directory in a Unix-style file system, co
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摘要：Longest Harmonious Subsequence (E) 题目 We define a harmonious array as an array where the difference between its maximum value and its minimum value is
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摘要：Linked List Cycle (E) 题目 Given a linked list, determine if it has a cycle in it. To represent a cycle in the given linked list, we use an integer pos
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摘要：Trim a Binary Search Tree (M) 题目 Given the root of a binary search tree and the lowest and highest boundaries as low and high, trim the tree so that a
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摘要：Number of 1 Bits (E) 题目 Write a function that takes an unsigned integer and return the number of '1' bits it has (also known as the Hamming weight). E
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