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You are given a 0-indexed integer array nums of even length consisting of an equal number of positive and negative integers. You should rearrange the 阅读全文
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Given the root of a binary tree, return the number of nodes where the value of the node is equal to the average of the values in its subtree. Note: Th 阅读全文
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Given a 0-indexed integer array nums, find a 0-indexed integer array answer where: answer.length == nums.length. answer[i] = |leftSum[i] - rightSum[i] 阅读全文
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(This problem is an interactive problem.) Each ship is located at an integer point on the sea represented by a cartesian plane, and each integer point 阅读全文
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You are given an integer array gifts denoting the number of gifts in various piles. Every second, you do the following: Choose the pile with the maxim 阅读全文
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A transaction is possibly invalid if: the amount exceeds $1000, or; if it occurs within (and including) 60 minutes of another transaction with the sam 阅读全文
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Given an array nums of distinct positive integers, return the number of tuples (a, b, c, d) such that a * b = c * d where a, b, c, and d are elements 阅读全文
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Given four integers length, width, height, and mass, representing the dimensions and mass of a box, respectively, return a string representing the cat 阅读全文
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You are given a 0-indexed integer array nums and an integer k. You have a starting score of 0. In one operation: choose an index i such that 0 <= i < 阅读全文
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Given a positive integer num, split it into two non-negative integers num1 and num2 such that: The concatenation of num1 and num2 is a permutation of 阅读全文
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There are n people standing in a line labeled from 1 to n. The first person in the line is holding a pillow initially. Every second, the person holdin 阅读全文
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On a 0-indexed 8 x 8 chessboard, there can be multiple black queens ad one white king. You are given a 2D integer array queens where queens[i] = [xQue 阅读全文
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There is a knight on an n x n chessboard. In a valid configuration, the knight starts at the top-left cell of the board and visits every cell on the b 阅读全文
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You are given two integers n and k and two integer arrays speed and efficiency both of length n. There are n engineers numbered from 1 to n. speed[i] 阅读全文
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You are given an integer array ranks representing the ranks of some mechanics. ranksi is the rank of the ith mechanic. A mechanic with a rank r can re 阅读全文
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You are given an integer array pref of size n. Find and return the array arr of size n that satisfies: pref[i] = arr[0] ^ arr[1] ^ ... ^ arr[i]. Note 阅读全文
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You are given a 0-indexed string s and a dictionary of words dictionary. You have to break s into one or more non-overlapping substrings such that eac 阅读全文
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You are playing a video game where you are defending your city from a group of n monsters. You are given a 0-indexed integer array dist of size n, whe 阅读全文
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Given an integer n and an integer array rounds. We have a circular track which consists of n sectors labeled from 1 to n. A marathon will be held on t 阅读全文
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You are given a 0-indexed integer array forts of length n representing the positions of several forts. forts[i] can be -1, 0, or 1 where: -1 represent 阅读全文