思路: 使用unordered_map暴力枚举. 实现: #include <bits/stdc++.h> using namespace std; class Solution { public: int countTriplets(vector<int>& A) { unordered_map<int, int> mp; int n = A.size(); ; i < n; i++) { ; j < n; j++) { int tmp = A[i…

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…

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. Example 1: I…

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…

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984. String Without AAA or BBB Given two integers A and B, return any string S such that: S has length A + B and contains exactly A 'a' letters, and exactly B 'b' letters; The substring 'aaa' does not occur in S; The substring 'bbb' does not occur in…

# Title Solution Acceptance Difficulty Frequency     4 Median of Two Sorted Arrays       27.2% Hard     10 Regular Expression Matching       25.6% Hard     23 Merge k Sorted Lists       35.8% Hard     25 Reverse Nodes in k-Group       37.7% Hard    …

Contest 121 (题号981-984)(2019年1月27日) 链接:https://leetcode.com/contest/weekly-contest-121 总结:2019年2月22日补充的报告.当时不想写.rank:1093/3924,AC:2/4.还是太慢了. [984]String Without AAA or BBB(第一题 4分)(Greedy, M) 给了两个数字,A 代表 A 个 ‘A’, B 代表 B 个‘B’ 在字符串里面.返回一个可行的字符串,字符串中包含 A…

题面 Given two integers \(n\) and \(x\), construct an array that satisfies the following conditions: ·for any element ai in the array, \(1≤ai<2^n\); ·there is no non-empty subsegment with bitwise XOR equal to \(0\) or \(x\), ·its length \(l\) should be…