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 字典统计 代码 复杂度分析 日期 题目地址:https://leetcode.com/problems/number-of-equivalent-domino-pairs/ 题目描述 Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d]…

problem 1128. Number of Equivalent Domino Pairs solution1: 不明白为什么每个元素都要加上count: class Solution { public: int numEquivDominoPairs(vector<vector<int>>& dominoes) { ; unordered_map<int, int> count; for(auto d:dominoes) { res += count[mi…

题目如下: Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d] if and only if either (a==c and b==d), or (a==d and b==c) - that is, one domino can be rotated to be equal to another domino. Return the number of pairs (i, j)…

这是小川的第394次更新,第428篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第259题(顺位题号是1128).给定多米诺骨牌列表,当且仅当(a == c且b == d)或(a == d且b == c),dominoes[i] = [a,b]等价于dominoes[j] = [c,d],也就是说,一个多米诺骨牌可以旋转到等价于另一个多米诺骨牌. 返回0 <= i < j < dominoes.length,并且dominoes[i]等价于dominoes[…

(domino.c/cpp)[问题描述] 小牛牛对多米诺骨牌有很大兴趣,然而她的骨牌比较特别,只有黑色和白色的两种.她觉 得如果存在连续三个骨牌是同一种颜色,那么这个骨牌排列便是不美观的.现在她有n个骨牌要来排列,她想知道不美观的排列的个数.由于数字较大,数学不好的 她不会统计,所以请你来帮忙.希望你帮她求出不美观的排列的个数. [输入数据] 只有一个正整数,即要排列的骨牌个数.[输出数据] 一个数,即不美观的排列个数.[样例输入] 4[样例输出] 6[样例解释] 有四种不美观的排列. 黑黑黑黑…

There are N dominoes in a line, and we place each domino vertically upright. In the beginning, we simultaneously push some of the dominoes either to the left or to the right. After each second, each domino that is falling to the left pushes the adjac…

We have two types of tiles: a 2x1 domino shape, and an "L" tromino shape. These shapes may be rotated. XX <- domino XX <- "L" tromino X Given N, how many ways are there to tile a 2 x N board? Return your answer modulo 10^9 + 7. (…

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. Return th…

版权声明: 本文为博主Bravo Yeung(知乎UserName同名)的原创文章,欲转载请先私信获博主允许,转载时请附上网址 http://blog.csdn.net/lzuacm. C#版 - Leetcode 191. Number of 1 Bits题解 191. 位1的个数 在线提交: https://leetcode-cn.com/problems/number-of-1-bits/description/ 题目描述 编写一个函数,输入是一个无符号整数,返回其二进制表达式中数字位数为…

Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by…