题目如下: Given an array of integers A, find the number of triples of indices (i, j, k) such that: 0 <= i < A.length 0 <= j < A.length 0 <= k < A.length A[i] & A[j] & A[k] == 0, where & represents the bitwise-AND operator. Exampl…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 日期 题目地址:https://leetcode.com/problems/triples-with-bitwise-and-equal-to-zero/ 题目描述 Given an array of integers A, find the number of triples of indices (i, j, k) such that: 0 <=…

题目链接:https://leetcode.com/problems/triples-with-bitwise-and-equal-to-zero/ 题意,已知数组A,长度不超过1000,最大的数不超过$2^{16}$,问存在多少对i,j,k,使得A[i]^A[j]^a[k]=0,i,j,k可以相等. 若直接暴力复杂度为$O(n^3)$,观察到数组不超过$2^{16}$,因此可以先枚举i和j,将结果存储,则结果不超过$2^{17}$,再查找符合的k,复杂度$O(n^2+n*2^{17})$. c…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 遍历一遍 日期 题目地址:https://leetcode.com/problems/minimum-domino-rotations-for-equal-row/ 题目描述 In a row of dominoes, A[i] and B[i] represent the top and bottom halves of the i-th domi…

题目如下: In a row of dominoes, A[i] and B[i] represent the top and bottom halves of the i-th domino.  (A domino is a tile with two numbers from 1 to 6 - one on each half of the tile.) We may rotate the i-th domino, so that A[i] and B[i] swap values. Ret…

[LeetCode]201. Bitwise AND of Numbers Range 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/bitwise-and-of-numbers-range/description/ 题目描述: Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers i…

[LeetCode]Minimum Depth of Binary Tree Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 递归和非递归,此提比较简单.广度优先遍历即可.关键之处就在于如何保持访问深度. 下面是4种代码: im…

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Could you optimize your algorithm to use only O(k) extra space? 思路:最简单的方法就是依照[Leetcode]Pascal's Triangle 的方式自顶向下依次求解,但会造成空间的浪费.若仅仅用一个vect…

53. Maximum Subarray[leetcode] Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [-2,1,-3,4,-1,2,1,-5,4],the contiguous subarray [4,-1,2,1] has the largest sum = 6. 挑…

27. Remove Element[leetcode] Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate extra space for another array, you must do this in place with constant memory. The order of elements can b…