原文链接: https://leetcode-cn.com/problems/prime-palindrome 英文原文Given an integer n, return the smallest prime palindrome greater than or equal to n. An integer is prime if it has exactly two divisors: 1 and itself. Note that 1 is not a prime number. For …

原文链接: https://leetcode-cn.com/problems/transpose-matrix 英文原文Given a 2D integer array matrix, return the transpose of matrix. The transpose of a matrix is the matrix flipped over its main diagonal, switching the matrix's row and column indices. Exampl…

原文链接: https://leetcode-cn.com/problems/binary-gap 英文原文Given a positive integer n, find and return the longest distance between any two adjacent 1's in the binary representation of n. If there are no two adjacent 1's, return 0. Two 1's are adjacent if…

原文链接: https://leetcode-cn.com/problems/minimum-number-of-refueling-stops 英文原文A car travels from a starting position to a destination which is target miles east of the starting position. There are gas stations along the way. The gas stations are repre…

原文链接: https://leetcode-cn.com/problems/advantage-shuffle 英文原文You are given two integer arrays nums1 and nums2 both of the same length. The advantage of nums1 with respect to nums2 is the number of indices i for which nums1[i] > nums2[i]. Return any p…

原文链接: https://leetcode-cn.com/problems/reordered-power-of-2 英文原文You are given an integer n. We reorder the digits in any order (including the original order) such that the leading digit is not zero. Return true if and only if we can do this so that t…

原文链接: https://leetcode-cn.com/problems/leaf-similar-trees 英文原文Consider all the leaves of a binary tree, from left to right order, the values of those leaves form a leaf value sequence. For example, in the given tree above, the leaf value sequence is …

原文链接: https://leetcode-cn.com/problems/length-of-longest-fibonacci-subsequence 英文原文A sequence x1, x2, ..., xn is Fibonacci-like if: n >= 3 xi + xi+1 == xi+2 for all i + 2 <= n Given a strictly increasing array arr of positive integers forming a seque…

原文链接: https://leetcode-cn.com/problems/walking-robot-simulation 英文原文A robot on an infinite XY-plane starts at point (0, 0) facing north. The robot can receive a sequence of these three possible types of commands: -2: Turn left 90 degrees. -1: Turn ri…

原文链接: https://leetcode-cn.com/problems/koko-eating-bananas 英文原文Koko loves to eat bananas. There are n piles of bananas, the ith pile has piles[i] bananas. The guards have gone and will come back in h hours. Koko can decide her bananas-per-hour eating…

原文链接: https://leetcode-cn.com/problems/middle-of-the-linked-list 英文原文Given the head of a singly linked list, return the middle node of the linked list. If there are two middle nodes, return the second middle node. Example 1: Input: head = [1,2,3,4,5]…

原文链接: https://leetcode-cn.com/problems/stone-game 英文原文Alice and Bob play a game with piles of stones. There are an even number of piles arranged in a row, and each pile has a positive integer number of stones piles[i]. The objective of the game is to…

原文链接: https://leetcode-cn.com/problems/nth-magical-number 英文原文A positive integer is magical if it is divisible by either a or b. Given the three integers n, a, and b, return the nth magical number. Since the answer may be very large, return it modulo…

原文链接: https://leetcode-cn.com/problems/profitable-schemes 英文原文There is a group of n members, and a list of various crimes they could commit. The ith crime generates a profit[i] and requires group[i] members to participate in it. If a member participa…

原文链接: https://leetcode-cn.com/problems/random-pick-with-weight 英文原文You are given a 0-indexed array of positive integers w where w[i] describes the weight of the ith index. You need to implement the function pickIndex(), which randomly picks an index …

原文链接: https://leetcode-cn.com/problems/random-flip-matrix 英文原文There is an m x n binary grid matrix with all the values set 0 initially. Design an algorithm to randomly pick an index (i, j) where matrix[i][j] == 0 and flips it to 1. All the indices (i…

原文链接: https://leetcode-cn.com/problems/loud-and-rich 英文原文There is a group of n people labeled from 0 to n - 1 where each person has a different amount of money and a different level of quietness. You are given an array richer where richer[i] = [ai, b…

原文链接: https://leetcode-cn.com/problems/shortest-subarray-with-sum-at-least-k 英文原文Given an integer array nums and an integer k, return the length of the shortest non-empty subarray of nums with a sum of at least k. If there is no such subarray, return…

原文链接: https://leetcode-cn.com/problems/implement-rand10-using-rand7 英文原文Given the API rand7() that generates a uniform random integer in the range [1, 7], write a function rand10() that generates a uniform random integer in the range [1, 10]. You can…

原文链接: https://leetcode-cn.com/problems/random-point-in-non-overlapping-rectangles 英文原文You are given an array of non-overlapping axis-aligned rectangles rects where rects[i] = [ai, bi, xi, yi] indicates that (ai, bi) is the bottom-left corner point of…

原文链接: https://leetcode-cn.com/problems/generate-random-point-in-a-circle 英文原文Given the radius and the position of the center of a circle, implement the function randPoint which generates a uniform random point inside the circle. Implement the Solutio…

原文链接: https://leetcode-cn.com/problems/decoded-string-at-index 英文原文You are given an encoded string s. To decode the string to a tape, the encoded string is read one character at a time and the following steps are taken: If the character read is a let…

原文链接: https://leetcode-cn.com/problems/reachable-nodes-in-subdivided-graph 英文原文You are given an undirected graph (the "original graph") with n nodes labeled from 0 to n - 1. You decide to subdivide each edge in the graph into a chain of nodes, with t…

原文链接: https://leetcode-cn.com/problems/boats-to-save-people 英文原文You are given an array people where people[i] is the weight of the ith person, and an infinite number of boats where each boat can carry a maximum weight of limit. Each boat carries at m…

原文链接: https://leetcode-cn.com/problems/projection-area-of-3d-shapes 英文原文You are given an n x n grid where we place some 1 x 1 x 1 cubes that are axis-aligned with the x, y, and z axes. Each value v = grid[i][j] represents a tower of v cubes placed on…

原文链接: https://leetcode-cn.com/problems/uncommon-words-from-two-sentences 英文原文A sentence is a string of single-space separated words where each word consists only of lowercase letters. A word is uncommon if it appears exactly once in one of the senten…

原文链接: https://leetcode-cn.com/problems/possible-bipartition 英文原文We want to split a group of n people (labeled from 1 to n) into two groups of any size. Each person may dislike some other people, and they should not go into the same group. Given the i…

原文链接: https://leetcode-cn.com/problems/super-egg-drop 英文原文You are given k identical eggs and you have access to a building with n floors labeled from 1 to n. You know that there exists a floor f where 0 <= f <= n such that any egg dropped at a floor …

原文链接: https://leetcode-cn.com/problems/fair-candy-swap 英文原文Alice and Bob have a different total number of candies. You are given two integer arrays aliceSizes and bobSizes where aliceSizes[i] is the number of candies of the ith box of candy that Alic…

原文链接: https://leetcode-cn.com/problems/construct-binary-tree-from-preorder-and-postorder-traversal 英文原文Given two integer arrays, preorder and postorder where preorder is the preorder traversal of a binary tree of distinct values and postorder is the …