02 2021 档案
摘要：Given two sequences pushed and popped with distinct values, return true if and only if this could have been the result of a sequence of push and pop o
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摘要：An array is monotonic if it is either monotone increasing or monotone decreasing. An array A is monotone increasing if for all i <= j, A[i] <= A[j]. A
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摘要：There are n buildings in a line. You are given an integer array heights of size n that represents the heights of the buildings in the line. The ocean
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摘要：Given two words word1 and word2, find the minimum number of steps required to make word1 and word2 the same, where in each step you can delete one cha
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摘要：Given a balanced parentheses string S, compute the score of the string based on the following rule: () has score 1 AB has score A + B, where A and B a
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摘要：Consider a directed graph, with nodes labelled 0, 1, ..., n-1. In this graph, each edge is either red or blue, and there could be self-edges or parall
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摘要：There are 3n piles of coins of varying size, you and your friends will take piles of coins as follows: In each step, you will choose any 3 piles of co
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摘要：Today, the bookstore owner has a store open for customers.length minutes. Every minute, some number of customers (customers[i]) enter the store, and a
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摘要：On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number on the display by 2, or; D
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摘要：In a warehouse, there is a row of barcodes, where the ith barcode is barcodes[i]. Rearrange the barcodes so that no two adjacent barcodes are equal. Y
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摘要：The diameter of a tree is the number of edges in the longest path in that tree. There is an undirected tree of n nodes labeled from 0 to n - 1. You ar
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摘要：Given the root of a binary tree, find the maximum average value of any subtree of that tree. (A subtree of a tree is any node of that tree plus all it
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摘要：An integer array is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the same
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摘要：Given a rectangular cake with height h and width w, and two arrays of integers horizontalCuts and verticalCuts where horizontalCuts[i] is the distance
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摘要：Given a m * n matrix mat of ones (representing soldiers) and zeros (representing civilians), return the indexes of the k weakest rows in the matrix or
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摘要：In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original data.
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摘要：Given an array of integers nums, sort the array in increasing order based on the frequency of the values. If multiple values have the same frequency,
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摘要：N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side b
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摘要：Given an n x n binary matrix grid, return the length of the shortest clear path in the matrix. If there is no clear path, return -1. A clear path in a
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摘要：Given an integer array arr, return the length of a maximum size turbulent subarray of arr. A subarray is turbulent if the comparison sign flips betwee
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摘要：The distance of a pair of integers a and b is defined as the absolute difference between a and b. Given an integer array nums and an integer k, return
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摘要：Given 3 positives numbers a, b and c. Return the minimum flips required in some bits of a and b to make ( a OR b == c ). (bitwise OR operation).Flip o
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摘要：You are given two strings s and t of the same length and an integer maxCost. You want to change s to t. Changing the ith character of s to ith charact
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摘要：Given an integer k, return the minimum number of Fibonacci numbers whose sum is equal to k. The same Fibonacci number can be used multiple times. The
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摘要：Given a string s and a character c that occurs in s, return an array of integers answer where answer.length == s.length and answer[i] is the shortest
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摘要：Given an array nums with n integers, your task is to check if it could become non-decreasing by modifying at most one element. We define an array is n
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摘要：There are several cards arranged in a row, and each card has an associated number of points. The points are given in the integer array cardPoints. In
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摘要：We define a harmonious array as an array where the difference between its maximum value and its minimum value is exactly 1. Given an integer array num
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摘要：You are given a string s that consists of lower case English letters and brackets. Reverse the strings in each pair of matching parentheses, starting
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摘要：Given an integer array arr, and an integer target, return the number of tuples i, j, k such that i < j < k and arr[i] + arr[j] + arr[k] == target. As
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摘要：You are given an integer array nums consisting of n elements, and an integer k. Find a contiguous subarray whose length is equal to k that has the max
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摘要：Given the root of a binary search tree and the lowest and highest boundaries as low and high, trim the tree so that all its elements lies in [low, hig
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摘要：There is an integer array nums that consists of n unique elements, but you have forgotten it. However, you do remember every pair of adjacent elements
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摘要：Alice and Bob have candy bars of different sizes: A[i] is the size of the i-th bar of candy that Alice has, and B[j] is the size of the j-th bar of ca
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