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You are given a string text. You should split it to k substrings (subtext1, subtext2, ..., subtextk) such that: subtexti is a non-empty string. The co 阅读全文
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Implement a SnapshotArray that supports the following interface: SnapshotArray(int length) initializes an array-like data structure with the given len 阅读全文
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Two players play a turn based game on a binary tree. We are given the root of this binary tree, and the number of nodes n in the tree. n is odd, and e 阅读全文
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Given an array nums of integers, a move consists of choosing any element and decreasing it by 1. An array A is a zigzag array if either: Every even-in 阅读全文
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Alice and Bob continue their games with piles of stones. There are a number of piles arranged in a row, and each pile has a positive integer number of 阅读全文
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Given a 2D grid of 0s and 1s, return the number of elements in the largest square subgrid that has all 1s on its border, or 0 if such a subgrid doesn' 阅读全文
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On an alphabet board, we start at position (0, 0), corresponding to character board[0][0]. Here, board = ["abcde", "fghij", "klmno", "pqrst", "uvwxy", 阅读全文
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The Tribonacci sequence Tn is defined as follows: T0 = 0, T1 = 1, T2 = 1, and Tn+3 = Tn + Tn+1 + Tn+2 for n >= 0. Given n, return the value of Tn. Exa 阅读全文
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Given two arrays of integers with equal lengths, return the maximum value of: |arr1[i] - arr1[j]| + |arr2[i] - arr2[j]| + |i - j| where the maximum is 阅读全文
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Given an array arr of positive integers, consider all binary trees such that: Each node has either 0 or 2 children; The values of arr correspond to th 阅读全文
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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 阅读全文
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Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d] if and only if either (a==c and b==d), or (a==d and b==c) - that 阅读全文
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In a project, you have a list of required skills req_skills, and a list of people. The ith person people[i] contains a list of skills that the person 阅读全文
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We are given hours, a list of the number of hours worked per day for a given employee. A day is considered to be a tiring day if and only if the numbe 阅读全文
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Given two arrays arr1 and arr2, the elements of arr2 are distinct, and all elements in arr2 are also in arr1. Sort the elements of arr1 such that the 阅读全文
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博主在用 Hexo 搭建博客的时候，一直在考虑评论系统用什么，最终比较了多家，决定用 Gitalk，这是一个基于 Github Issues 的评论系统，所有的评论内容都保存在 Github Issues 中，每篇博客对应一个 Issues。只有登陆 Github 账号才能评论，大多数人应该都会有 阅读全文
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A string is a valid parentheses string (denoted VPS) if and only if it consists of "(" and ")" characters only, and: It is the empty string, or It can 阅读全文
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Given the root of a binary tree, each node in the tree has a distinct value. After deleting all nodes with a value in to_delete, we are left with a fo 阅读全文
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There are n flights that are labeled from 1 to n. You are given an array of flight bookings bookings, where bookings[i] = [firsti, lasti, seatsi] repr 阅读全文
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Given a valid (IPv4) IP address, return a defanged version of that IP address. A defanged IP address replaces every period "." with "[.]". Example 1: 阅读全文
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Return the result of evaluating a given boolean expression, represented as a string. An expression can either be: "t", evaluating to True; "f", evalua 阅读全文
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When you run hexo g, you might get the following error: call_and_retry_last allocation failed - javascript heap out of memory Solution: Try to run exp 阅读全文
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We have a sequence of books: the i-th book has thickness books[i][0] and height books[i][1]. We want to place these books in order onto bookcase shelv 阅读全文
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When use nginx to configure https with ssl 443 port, it might be timed out, but your http 80 port work correctly. At this time, if you nginx configure 阅读全文
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In an infinite binary tree where every node has two children, the nodes are labelled in row order. In the odd numbered rows (ie., the first, third, fi 阅读全文
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Once you deployed the hexo with Nginx on your web instance, you might get the 403 forbidden error, try the following step to fix: Solution: Run vim /e 阅读全文
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When you run hexo g on any web instances, like on AWS or Azure, you might get the following error: (node:3568) ExperimentalWarning: The fs.promises AP 阅读全文
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We distribute some number of candies, to a row of n = num_people people in the following way: We then give 1 candy to the first person, 2 candies to t 阅读全文
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Under a grammar given below, strings can represent a set of lowercase words. Let's use R(expr) to denote the set of words the expression represents. G 阅读全文
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(This problem is an interactive problem.) You may recall that an array A is a mountain array if and only if: A.length >= 3 There exists some i with 0 阅读全文
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When running hexo server, you might get the following error: console.js:35 throw new TypeError('Console expects a writable stream instance'); ^ TypeEr 阅读全文
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Sometimes your hexo environment may get fucked up, may give you the following errors: ERROR Local hexo not found in /YourProjectPath/ ERROR Try runnin 阅读全文
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You are driving a vehicle that has capacity empty seats initially available for passengers. The vehicle only drives east (ie. it cannot turn around an 阅读全文
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You are given a large sample of integers in the range [0, 255]. Since the sample is so large, it is represented by an array count where count[k] is th 阅读全文
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Given two strings str1 and str2, return the shortest string that has both str1 and str2 as subsequences. If multiple answers exist, you may return any 阅读全文
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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 阅读全文
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We have a set of items: the i-th item has value values[i] and label labels[i]. Then, we choose a subset S of these items, such that: |S| <= num_wanted 阅读全文
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Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right. Note that elements beyond 阅读全文
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We can rotate digits by 180 degrees to form new digits. When 0, 1, 6, 8, 9 are rotated 180 degrees, they become 0, 1, 9, 8, 6 respectively. When 2, 3, 阅读全文
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On a campus represented as a 2D grid, there are N workers and M bikes, with N <= M. Each worker and bike is a 2D coordinate on this grid. Our goal is 阅读全文
