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You are given two positive integers n and k. You can choose any bit in the binary representation of n that is equal to 1 and change it to 0. Return th 阅读全文
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Given a string s containing only digits, return the lexicographically smallest string that can be obtained after swapping adjacent digits in s with th 阅读全文
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For a binary tree T, we can define a flip operation as follows: choose any node, and swap the left and right child subtrees. A binary tree X is flip e 阅读全文
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Given an integer array hours representing times in hours, return an integer denoting the number of pairs i, j where i < j and hours[i] + hours[j] form 阅读全文
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You are given an integer array nums and an integer k. For each index i where 0 <= i < nums.length, change nums[i] to be either nums[i] + k or nums[i] 阅读全文
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Given two positive integers n and k, the binary string Sn is formed as follows: S1 = "0" Si = Si - 1 + "1" + reverse(invert(Si - 1)) for i > 1 Where + 阅读全文
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You are given an integer array nums and an integer k. In one operation, you can choose any index i where 0 <= i < nums.length and change nums[i] to nu 阅读全文
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You are given a 2D integer array intervals where intervals[i] = [left, right] represents the inclusive interval [left, right]. You have to divide the 阅读全文
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A ramp in an integer array nums is a pair (i, j) for which i < j and nums[i] <= nums[j]. The width of such a ramp is j - i. Given an integer array num 阅读全文
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You are given a positive integer array skill of even length n where skill[i] denotes the skill of the ith player. Divide the players into n / 2 teams 阅读全文
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Given an array of integers arr of even length n and an integer k. We want to divide the array into exactly n / 2 pairs such that the sum of each pair 阅读全文
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Design your implementation of the circular double-ended queue (deque). Implement the MyCircularDeque class: MyCircularDeque(int k) Initializes the deq 阅读全文
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An alphabetical continuous string is a string consisting of consecutive letters in the alphabet. In other words, it is any substring of the string "ab 阅读全文
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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 on 阅读全文
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You are given an integer array nums of size n. Consider a non-empty subarray from nums that has the maximum possible bitwise AND. In other words, let 阅读全文
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You are given two integers m and n, which represent the dimensions of a matrix. You are also given the head of a linked list of integers. Generate an 阅读全文
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You start at the cell (rStart, cStart) of an rows x cols grid facing east. The northwest corner is at the first row and column in the grid, and the so 阅读全文
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You are given the head of a linked list, which contains a series of integers separated by 0's. The beginning and end of the linked list will have Node 阅读全文
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You are given a 2D matrix grid of size m x n. You need to check if each cell grid[i][j] is: Equal to the cell below it, i.e. grid[i][j] == grid[i + 1] 阅读全文
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A distinct string is a string that is present only once in an array. Given an array of strings arr, and an integer k, return the kth distinct string p 阅读全文